At the same time, Bill hasn't done much to suggest he does want Mac to be his QB. You can sort of point to the hiring of BOB, but the team needed an OC regardless so he may have likely hired BOB whether Mac was rostered or not.
A point Florio made on a podcast yesterday which rings true - if Bill thinks a QB is his starter, he makes it pretty damn clear. He scoffed and rolled his eyes and chastised reporters for years when people suggested Brady should be benched for Garoppolo. In the Cam Newton year, he clearly stated at every opportunity that Cam is the QB. You can kind of see Bill taking a somewhat similar approach last offseason putting praise on Mac, but during the season that completely disappeared and he has very purposefully chosen not to say Mac is their guy and that this offseason will be a competition. I really don't think Bill believes in him at the moment.