These are guys with about a 1 in 50 chance of sticking

These guys have very little chance of making it. Partly because 4th round and above guys are going to make the roster unless they are complete training camp busts.

The Rams just don't have that many openings. But you need around 90 guys for training camp and early preseason. They just want a chance to put something on tape and maybe to make a PS.