Philp is still coming back from a year off, I think it’s smart to give him time to get back up to speed playing lots of minutes in the A before you bring him up to be a full time 4C playing 8-9 minutes a night in the bigs.
That said you still want enough time to get a good sample on him before the trade deadline, I’d say bring him up right after the holidays and play him in that 4C spot full time and work Ryan in on the fourth line every now and then. He’s been a good soldier but he isn’t an every day player at this point, he’s an excellent 13th though.