If Rubtsov stays healthy, Vorobyev wouldn't sniff the NHL this year.
Vorobyev wasn't a dominant AHL player, and he's not some uber talent who just needed a little experience before making the jump.
Guys like Vorobyev should marinate in the AHL until they show they're too good for that level.
Bailey is a good example, he played 8 games at age 21, 32 at 22, 12 at 23 for Buffalo, now he gets a shot here, and he's got more talent than Vorobyev. But he never took the next step in the AHL, and has never produced in the NHL. If the Flyers were deeper, he'd stay in the AHL until he showed he was committed to filling a bottom six role (i.e. willing to forecheck, skate hard and be defensively responsible).
Varone is a bit different, AHL MVP at 27, nothing more to prove, he's getting a shot but I doubt he's in their long-term plans, rather, he's being rewarded, but I expect him back in the AHL, making $200K a year to be a mentor on the Phantoms.