Outside of a few elite players, how many NHL players hit their strike at 20? 21? 22? 23?
Point is fans want to see prospects right away because of the novelty factor, but Hextall been around the game for 3 decades, he's seen a lot of talent young players crash and burn because they were rushed to the NHL.
The Flyer prospects who skipped a year of junior - Provorv (#7), Konency (#24), Patrick (#2).
Laughton (#20) played a half season in the AHL at 20 years old, came up, played at 21, struggled, went down at age 22, back at age 23.
Most of the Flyer prospects aren't 1st rd picks, so they're likely to take longer to develop (since if they were that talented and polished, they would have been drafted higher).
Look at some drafts:
2015:
1st rd, Strom #3 (AHL), Meier #9 (half year AHL at 20), Gurianov #12 (KHL), Zboril #13 (AHL), Debursk #14 (full AHL at 20), Sensyhyn #15 (AHL), Barzal #16 (2 years junior), Conner #17 (50 AHL games at 20), Chabot #18 (2yr jun, 10 games AHL), Svechnikov #19 (2nd year AHL), Ek #20 (SHL/NHL 19), White #21 (2yr BC, now AHL), Samsonov #22 (KHL), Boeser #23 (2yr ND, NHL at 20), Roslovic #25 (2nd AHL), Juulsen #26 (AHL inj), Larsson #27 (AHL), Beauvillier #28 (1 jun), Carlsson #29 (NHL at 20), Merkley #30 (AHL)
So most of the top 10 make it early, a few after that skip their junior season, the rest either hit the NHL at 20+, with some still in the AHL.
And those are 1st rd picks.
2nd rd, only 2 players made it early, Aho #35, Carlo #37, a few this season, Fischer #32, Greer #39, Sprong #46, Dunn #56
Notice only two players in the NHL from 41-100
Others, Malgin, #102, Nutivaara #189
2014:
top 10 picks, 7 have played over 100 games. 4 of the next 20.
After the 1st rd, Barbashev #33, (1 1/2 in AHL), Montour #55 (1 1/2 in AHL), Dvorak #58 (2yr jun then NHL), Tryamkin #61 (KHL to NHL at 21), Point #79 (2 yr jun), Arvidsson #112 (1 yr + AHL), LaBanc #171 (19 AHL games)
So it's very rare for players outside of the 1st rd to make the NHL in three years, and even then many spend a year or more in the AHL.
So it's really no surprise that almost all our prospects outside the 1st rd spend a year in the AHL, it's pretty normal for prospects who aren't elite to spend 1-2 years in the AHL.