Based on Hacksaw's chart on the MVC Report:
MSU
If MSU wins at Evansville, their best seed is 3 and their worst seed is 3.
If MSU loses at Evansville, their best seed is 3 and their worst seed is 8.
Drake
If Drake wins in Wichita, their best seed is 3 and their worst seed is 4.
If Drake loses in Wichita, their best seed is 4 and their worst seed is 8.
Illinois St
If Illinois St wins at Bradley, their best seed is 3 and their worst seed is 7.
If Illinois St loses at Bradley, their best seed is 7 and their worst seed is 8.
Evansville
If Evansville wins vs. MSU, their best seed is 3 and their worst seed is 6.
If Evansville loses vs. MSU, their best seed is 6 and their worst seed is 8.
Northern Iowa
If Northern Iowa wins at SIU, their best seed is 4 and their worst seed is 7
If Northern Iowa loses at SIU, their best seed is 6 and their worst seed is 8.
Indiana State
If Indiana State wins vs. Creighton, their best seed is 3 and their worst seed is 6
If Indiana State loses vs. Creighton, their best seed is 5 and their worst seed is 8.
Summary
Only MSU has full control of their seed with a win. But everyone except UNI and Illinois State will guarantee a top 6 seed with a win.