All three have starting NFL expereince, lets give them one regular season game before we bury them 6 feet under
Weaver has been hurt, alot but is as close to 100% as he's been since signing with Casserly via free agency. Not to mention he was brought into the mix as a 3-4 DT.
Greenwood, also signed by Casserly, was to be a 3-4 LILB. So its understandable he looks out of position @ times. Still he has been productive in his first season w/Texans in 05 he led the team by a large margin in total tackles with 112. His first season in the 4-3 (06) he finished 2nd on the team to DeMeco with 111. last year he recorded 119 tackles once again 2nd on the Texans behind DeMeco.
Reeves its kinda early don't you think? I mean be realistic here, new team & scheme with different coaches & players around him. just be patient. I know its hard but a tweak here & there (more physical @ the line of scrimmage, good hard jam/interference before the 5 yd rule, turn head & locate ball in flight & learn how to be a technically sound tackler like Bennett & Robinson) should get him straightend out when the games count.