Perhaps, and I'm just spit-balling, they like Collins more and/or want another tackle so they can kick Wynn inside.Also, why would the Pats trade Mason to save $7 million only to turn around and take on Collins at $10 million?
Edit: Or they are trading Wynn and need another tackle. Or Trent is going to be too expensive and they are re-configuring the line. Or they are just freeing up space to pay Allen Robinson and there are other moves coming. Or...