I think Morrow has the most upside of any D prospect. His ceiling is similar to Klingberg.
Seeley has some superficial similarities to Slavin (excellent skater, incredibly low PIM), but I think the more reasonable comparable for ceiling is the one the Canes let get away in Forsling.
I haven't seen other than highlights of Nikishin, his ceiling is something like Edmundson. He has a higher probability of reaching it as his floor and ceiling are close.
Fensore is as talented as any D prospect, but while there are several 5'9" blue liners, there just aren't any 5'7".
I have always liked Keane and Sellgren, but I think both are nearing their sell-by date and neither has blown up in the AHL.
If you really want a list:
- Morrow--high boom/bust quotient
- Seeley--I admit bias
- Heimosalmi--another I haven't seen more than highlights, but really impressive international results
- Nikishin--at a minimum should be similar to Hakanpää
- Hreschuk/Honka/Fensore--all have some NHL qualities