Based on what Bielema said Collins won't be drafted in the first 3 rounds and will have to fight for an NFL roster spot. Same for Kirkland. I think Kirklands natural position is guard but because of need had to play tackle this year. I think he should come back, play the guard position and improve his draft stock.
As for Collins, his position is more complicated. There are some good RB's coming out this year as well as next year. He did show very good durability but did have fumble issues. Maybe he needs to come back, find out what concerns the NFL scouts have on him, and work on those concerns. Maybe with better RB depth he will be fresher and perform better for those scouts but at least get his degree! If we can still convince Whaley, White or Porter to come and sell them they can run behind Collins and share the load and both be 1000 yd rushers which us a must in the SEC.