I really never thought of Hogberg as a definite future NHL goalie when he was playing in SHL. Sure he put up some good numbers one year but overall didn't look like a complete stud doing that. As a junior he was always one step behind Oscar Dansk. I'd definitely not put him among top 5 Swedish goalie prospects born in the 90's, more likely within 6-8. Both Nilsson and Gus would be a much better fit on a top 5 list (with Markstrom, Lehner and Dansk being the other ones). Kind of odd that the three now are within the same organization, and that Lehner also has passed through!
All in all, if Hogberg becomes a regular NHL'er, I'd say it's a result of good coaching staff within the Sens. However, I'd not be surprised if Gus would replace him in a few years time, his potential when comparing them at the same age is definitely higher.