Kriterion's criteria is very labour intensive, and it's not easy to see everything, but that's because he's working off a stasguru based on team and all formats, but not Batsmen/Bowlers for a specific format.
For what you want Jemisi - which is all victories for that period, you can use this link for batsmen:
http://stats.espncricinfo.com/ci/engine ... pe=batting
And this one for bowlers:
http://stats.espncricinfo.com/ci/engine ... ew=innings
It's ODIs, but you can switch between formats at the top. Obviously Hami and Utseya will be way ahead of everyone in terms of winning matches for Zimbabwe, partly because they often led from the front - Hami in the top order, and Utseya opening the bowling often but appreciating the need to bowl 10 overs. If they did very well - score runs or keep it tight in the power play, that was Zimbabwe's chance. Only thing that prevents Taibu form topping that list is he as absent a lot, and retired early. Purely because of his allround abilities Elton Chigumbura is easily Zimbabwe's best player overall in matches that they have won. He is essentially Zimbabwe's MVP by quite some distance. I'll defer Vusi comments in that format to other people because apparently I'm biased.
Other small things you'll notice when you zoom in, is that in innings that Taylor did well for Zimbabwe in ODIs and they won against the "top 8", he opened the batting. Raza averages just 9 in the T20s Zimbabwe have won, while allrounder Williams averages 18 with the bat as well as 31 with the ball. It's safe to say that T20s is not a format for them. Mpofu has been a big player in ODIs Zimbabwe have won, but the allround talent of Utseya and Cremer has been understated because their batting has been impressive in Zim ODI wins. With the ball, Malcolm and Tiripano were untterly hopeless in Zim ODI wins. Malcolm and Sean scoring about 100 runs more than they conceded with the ball, while Raza scored 300 runs more than he conceded, and has by far the highest batting average - of everyone 71.30. Cometh the hour, cometh the man!
Watambwa and Blignaut were huge losses for Zimbabwe cricket.