Yes, I'm sure Colombo will be gone... Unfortunately, he'd be the cheapest of all of them to keep, so letting him go won't save us a whole lot.
I can't decide on Canty. I think he improved a lot last year, and is a great locker room guy -- very smart and a great attitude. But we just have more possibilities there than we do at safety right now.
Mickey was saying yesterday that Todd Grantham was very excited by Tank and that he'd improved himself a ton in the offseason program. Said he'd been very dedicated and was even taking on something of a leadership role in the weight room. So maybe he starts at NT and you use Rat at end. I'd be very nervous counting on a guy like Tank who could get booted at the first hint of an off-field problem, though.
Looking at the big picture, something bugs me about signing all the little guys and letting the guys in the trenches go.