Hey it maybe just me but in Co-op mode I finaly have Stetmann grinded to prestige 3 Oil Baron. The thing is that units get stacks of Oil that increases attack speed and health regen.
In the few games I played with him I noticed that the Gary unit’s and the lurkers seem to be impossible to get any stack of Oil.
I’m not sure if this is an bug or intenional but I couldn’t find any notes about that these units should not get the stacks. I’m gonna test some more to see if there are other untis that don’t get the stack.