With no true No. 1 wide receiver on the roster, some might have anticipated a more abrasive posture from quarterback Josh Allen as the Bills open offseason workouts. But as the Bills transform the roster, Allen said he's accepting the unspoken challenge of becoming a better leader. "It's definitely hard to part ways with a guy that's been very instrumental in our success the last four years," Allen said Thursday of reporting to work without wide receiver Stefon Diggs in tow. "We made a lot of changes this offseason. We lost a lot of veteran leadership — Stef being one of them. Going into Year 7 now, it just kind of is what it is. I don't get paid to make changes on the team. I get paid to be the best quarterback I can be and try to lead the guys o…