Hollins chose to leave. He is a journeyman player at this point, with no loyalty to anyone except his bank account. Good for him, but Mack Hollins is dead to me, from a Bills Fandom perspective.
Mack Hollins is a journeyman and a mercenary, who has loyalty to his current team and season. He was dead to me when he signed with the Pats. Simple. He establishes zero roots anywhere and goes off with his barefeet and "Mr. Wizards world" self help videos.
I think THIS is exactly what the plan is. Wave 2 D-line will be Big Phil at 3 and Walker at 1. Walker has technically been the 1 next to Daquon since week 2.