Let's take a look at Charlie Weis' career:
1991-1992: RB coach for NYG
Rodney Hampton ranks 4th and 6th for fantasy purposes. He never again finished in the top ten once Weis left, and he was clearly at his best the two years Weis coached him.
1993-1994: TE coach for NE
Ben Coates had played two seasons before Weis arrived in NE, totaling just 266 yards. Weis' first year with Coates, he jumped to the third best TE in FF, posting 659-8. The following season, Coates posted his best year by far, and set a TE record for catches: 96-1174-7. Weis remained in NE until 1996, and Coates produced pretty well until 1998.
1995: RB coach for NE
Curtis Martin was a rookie in 1995, so there's no previous performance with which to compare. Despite having a phenomenal, HOF career, Martin's best year for fantasy purposes was his rookie season. He was the second ranked RB that year.
1996: WR coach for NE
Another year, another position change, and another rookie to mold. Weis' coached Terry Glenn to ROY honors, producing 90-1132-6....the best year of his career.
Note: Charlie Weis coached the RBs in 1995 and the WRs in 1996 for the Patriots. In 1995, the Patriots ranked tenth in rushing yards and fourteenth in passing yards. They ranked 14th in yards per carry and 29th in yards per attempt.
In 1996, the Patriots ranked 26th in rushing yards, and third in passing yards. They ranked 25th in yards per carry and 19th in yards per attempt.
1997-1999: OC/WR coach for NYJ
Vinny Testaverde posted by far the best year of his career in 1998 under Weis. Testaverde threw 29 TDs and 7 INTs, and went 12-1 as a starter.
From
http://www.patriots.com/team/index.cfm?ac=coachbio&bio=515
From 1997 to 1999, Weis called the offensive plays for the New York Jets. In his first season with the Jets, New York improved from 1-15 in 1996 to 9-7 in 1997. The eight-game improvement was the best in franchise history. In 1998, Weis was named the offensive coordinator/wide receivers coach after a year of handling the dual responsibilities. By season’s end, his offense ranked among the greatest in franchise history and led the team to their first division title. The team scored 416 points, the second highest total in franchise history (419 points in 1968) and averaged 357.2 yards per game. It was the second-best season average in Jets history (368.5 ypg in 1985). Both of Weis’ starting receivers, Johnson (1,131) and Chrebet (1,083), eclipsed the 1,000-yard receiving plateau for the first time in their respective careers. It also marked the first time since 1986 that two Jets receivers reached that milestone in one season.
In 1999, Weis’ offense produced the league’s second-leading rusher and the AFC’s fourth ranked receiver. Martin rushed for 1,464 yards, falling just 90 yards shy of the rushing title. Johnson led the team and established career-highs with 89 receptions for 1,170 yards. He earned his second consecutive Pro Bowl nod at the end of the season.
2000-2004: OC/QB coach for NE
Weis became QB coach in 2001, Brady's first year starting. He's looked pretty good.
The point of all this? Charlie Weis has had tremendous success at every level and by every measure of his NFL career. Terry Glenn and Ben Coathes thrived under Weis, as did Curtis Martin, and Tom Brady. There's enough speculation on my part that Brady wouldn't have been able to win the SB without a great defense and great coaching. As a result, there's just too small of a sample to vote him in after four years.