I seem to recall that whatever Ryan (and Sophie?) are capable of, it took Thomas out, leaving him with one arm and no memory, and (one supposes) no functional soot powers (since I don't recall what Thomas' soot power was, and haven't seen him use any since he lost his memory - I don't think we've even seen him shift between his shadow and living doll form, it seems likely that he's only human now....)
So, I think it's certainly dangerous to underestimate Ryan and Sophie, and certainly Dorothy, too.
For his part, Ryan seems pretty sure of himself and his ability to take on Edward and his sidekicks, combined with Maryrose and Rosemary - I don't quite recall what Gerald's soot power is (EDIT: oh yeah, that's right: he can move/levitate objects that have been dusted with his soot!), and Eileen's exploding carrier pigeons haven't proven to be very intimidating so far, but we do know that Edward at least can be pretty dangerous, and Rosemary/Maryrose were a pretty fair challenge to at least Kate and all her friends for the Phantom arc: Ryan may well have a good reason to be so confident and arrogant as to take on all five of these characters at once, but if so, we can only conclude that Ryan is an exceptionally dangerous shadow.
Meanwhile, Joseph seems pretty sure he can handle Sophie alone, backed up by a "Soot Management" power, which I'm having a little difficulty imagining to be much help in a fight. I don't think we know a lot about Sophie, but if she's been sitting on about as much power as Dorothy, then Joseph might be at a disadvantage here.
And THAT is before we consider whatever the Grandfather might be capable of, and it assumes that Joseph and/or Thomas can be trusted, which we really have only the flimsiest reasons to assume so far. It at least SEEMS so far like Joseph is splitting up "the guards" to expose the Grandfather to Kate, and Thomas surely was hurt by Ryan and Sophie, but Thomas' loss of memory does seem rather convenient (though I suspect that's a side effect of Sophie's soot power, which I assume to be the power to eat other shadows' powers), while Joseph's actions in this chapter might also be interpreted as leading Kate into a trap (and after all, we really don't fully understand Joseph's motives for now, beyond what he's claimed to Kate: even if we assume he really is trying to subvert Grandfather's authority, it doesn't necessarily mean he's on Kate's side!)