Here is a link to some details on RB/KR Stefan Logan, newest signee ... http://www.nfldraftscout.com/ratings/dsprofile.php?pyid=67472&draftyear=2007&genpos=RB
The guy is tiny (not qute 5-7 and about 180) and has already been with at least two NFL teams (Giants and Dolphins) since going undrafted in 07. The fact he has pro experience of any kind makes him a better prospect than someone like skier/underwear model Jeremy Bloom. The open space of the CFL is perfect for him, the closed space of the NFL not so much. Logan was the No. 1 running back for the Lions (899 rushing yards, 7.3 avg; 477 reception yards, 9.2 avg; not their primary kick returner (neither kickoffs nor punts). He had 13 punt returns for 138 yards, 9 KO returns for 266 yards. The CFL's best kick returner last year was Dominique Dorsey of the Toronto Argonauts and he signed with Washington.
I'd say Logan has next to no chance of being a third-down back because he is too small to block anyone. He also fumbled the ball quite a bit in the CFL. But we don't need a third-down back. If he can hang onto the ball and stay healthy, he has a shot as a KR/PR and obviously the Steelers saw enough when Logan worked out in Pittsburgh last month to offer him a contract. A longshot but an interesting one.