Among the things, Fleita said, are baserunning, bunting and knowing when to swing at the first pitch.
"A lot of it is experience," he said. "I couldn't ask for more than he's done the last three, four weeks. I always felt he was a catalyst. He helped put them there [in contention for a playoff spot]. He hit 15 home runs, five of them in the last month."
If he had been called up, Pie would've spent most of the time on the bench in the final 3 1/2 weeks of the Cubs' season.
"Looking at it positively, he wasn't going to play a lot," Fleita said. "I'd like to see him get his head together, play a lot and have a good winter. I'm sure he thought, 'I'm the only guy who wasn't called up.'"
Pie will go to Arizona and work with former Cub Bobby Dernier on his baserunning and bunting, then play for Licey in the Dominican Republic. Cubs coach Von Joshua will be the manager there.
One of the Cubs' other hot prospects is pitcher Jeff Samardzija, who is now starring at wide receiver for Notre Dame. He was a fifth-round pick in June and did pitch for the Cubs' two Class A teams, Boise and Peoria.
"I think when you looked at him, there's no doubt that, if he played baseball full-time, he has a chance to be a heck of a pitcher," Fleita said. "He's quite an athlete. I know they like him up in South Bend [at Notre Dame]. He's a great person. He'd be a great teammate. He keeps in touch with all the guys in Boise. We were in the midst of winning a championship and he was text messaging all the guys there."
Ryu and Reyes were called up from Triple-A Iowa, which ended its season on Monday.
Ryu, 23, is making his fourth stint with the Cubs. He spent most of the season at Iowa, going 8-8 with a 3.23 ERA in 24 games and held opponents to a .237 batting average. Reyes, 23, split this season between Double-A West Tenn and Iowa, and hit .238 for the season in 84 games. A switch-hitter, he batted .357 in 17 games in August with Iowa. Reyes will wear No. 61.
Roster moves: The Cubs completed their deal with the Minnesota Twins on Tuesday regarding the player to be named later in the Phil Nevin trade.
The Cubs acquired right-handed pitcher Adam Harben. Harben, 23, was 32-28 in 103 Minor League games, including 91 starts, while posting a career 3.40 ERA. He's given up 21 home runs in 513 1/3 innings and struck out 468. This season, he had a 3.96 ERA in 29 games (22 starts) at Double-A New Britain.
In another transaction, right-handed pitcher Jerome Williams was claimed off waivers by the Oakland Athletics. Williams, 24, was acquired by the Cubs in May 2005, for LaTroy Hawkins, and began this season in the rotation. He was 0-2 with a 7.30 ERA in five games and was then demoted to Iowa.
"It didn't work out," Cubs manager Dusty Baker said. "[The Athletics] have a very good idea of Jerome. I have a pretty good idea of Jerome. I didn't see the Jerome I'd hoped to see or we'd hoped to see. Sometimes these things happen."
Extra bases: Baker talked to Michael Barrett on Monday, and the Cubs catcher was still in a lot of pain after undergoing surgery in his groin. Barrett was hurt by a foul tip on Saturday. ... The Cubs took their annual team photo before Tuesday's game. "They'll need to put names by a lot of people," Baker said of the caption. "It'd probably be apropos to put one-third Tennessee, one-third Iowa and one-third Chicago. It would've been a lot different team picture a couple months ago." ... The Cubs pitchers have totaled 1,000 strikeouts for the seventh consecutive season. ... Wrigley Field organist Gary Pressy worked his 1,600th career game Tuesday. ... The Cubs' wives and Bank of America will host the fourth annual food drive on Sept. 16 at Wrigley Field. Donations will be accepted from 1 p.m. CT until the third inning at the corner of Sheffield Avenue and Addison Street.
Minor matters: Eric Patterson and Jesse Hoorelbeke each homered in Iowa's 4-3 win over Omaha in the season finale Monday. The Iowa Cubs finished 76-68, and tied for first in the Northern Division. Pie had three hits and stole a base. ... J.R. Mathes gave up one run on six hits over nine innings in West Tenn's 4-1 win over Chattanooga. The Diamond Jaxx ended the second half 32-38, and finished the season 75-65. Brandon Sing hit a two-run homer and Richard Lewis and Chris Walker each had two hits. ... Joel Santo gave up two runs, one earned, on three hits over four innings in Peoria's 2-0 loss to Beloit. ... Russell Canzler had two hits and one RBI in Boise's 8-2 win over Tri-City.
On deck: Lefty Rich Hill will start Game 3 of the Cubs' four-game series against the Pittsburgh Pirates on Wednesday night. Game time is 7:05 CT and will be broadcast on WGN Radio and Comcast Sports Net.