People still think Flyers have a fixation on size, even with Briere as GM (undersized forward who bounced between AHL and NHL until he won a job, then one of the best PO scorers in NHL history) and Sharp (another guy who bounced around until he got to start in Chicago).
I don't know if they know what they're doing, either they're smarter than the average bear or too smart for their own good.
But:
1) they've revamped the development staff, Briere did this gradually, same with scouting, but he's got his people in place now.
2) they have a good track record of improving skating, Foerster, Cates, Brink, et al. Not everyone, Strome went from awful to bad and is a career AHL guy, Ginning never miproved. But enough to think they might be able to recognize skating flaws that can be fixed.
3) they have a good track record of teaching fundamentals at LHV, most of the call-ups held their own relative to their raw talent.
Berglund struggled with injuries last season and was bounced around SHL to Swedish Juniors to Allsvenskan. Should have spent the whole year in Allsvenskan at 18. But he's similar to the players they drafted this year, big, some skating issues but good hands, work ethic, motor. Enough skill that if you fix the skating issues you might have a steal.
Gill, Nesbitt fit that mold. They're betting that as these kids fill out their bodies (especially lower body) and get skating coaching, they'll become more explosive skaters that'll allow them to use their size and skill.
The Flyers are faster than average (see Edge) but also smaller than average, and that has shown up finishing plays, they have few forwards who can create havoc in front of the net and the hands to exploit that havoc. Briere likes his smaller players to go to the dirty areas, but guys like TK, Barkey and Brink are always going to be limited there due to size. As Florida showed, physical forwards who go to the net create problems for defense. Michkov as he fills out will be able to anchor, but you don't want him lost in traffic. Guys like Foerster, Nesbitt, Murtaugh et al are built for that role.