If Duke Williams is a better blocker than Jason Croom then why would they keep Croom over him? Duke can play some specials and as Gunner alluded to, they have been using him almost like a tight end at times, lining him up in a tight slot position not far from the OT. I think if Kroft is on the PUP it opens the door for them to keep Duke as a sort of big receiver/TE hybrid. Croom has the "TE" label so it looks more normal on the depth chart to keep him but he can't really play in-line anyway. Duke may be the more useful player now and the player with more upside.
I also thought Jordan Phillips had a good night to cap a nice preseason for him, he looks better than last year. He's working hard to get that money in the offseason and we're going to benefit for it...