Kind of far off but...

All of them are possible besides Silas. He isn't 5 star exclusive.

I would say HS Ryoma is pretty unlikely. HS units should be released between January and February (unless IS pulls something weird).

Quan should show up in one of those 2 months.

That leaves us with Kliff, Ophelia, HNiles, Ylgr and ACorrinM.

My bet is on HNiles, as March should be the month to finish up Halloween seasonals. It will depend on what color Februrary legendary will be (it's either blue or red) and what Halloween unit will be featured in it (it should be only one, leaving the other three for the April legendary banner).

January I say 90%+ probability that Quan appears with HF Ryoma, so I would say less than 10% probability that those two will appear in March.

Silas, RoyAhoy has dealt with. The remaining three are all possible, along with M.Azurcorrin and Ylgr. At the moment I have a pretty hard time figuring out what's going to happen with blues. Here's the best I can offer:

SS Linde is probably coming next month with HF Micaiah and Ryoma. They need to finish the Sketchy Summer banner, and we have already two swords in red and no other obvious candidate for a unit that hits res. There's no room for B.Celica and B.Ephraim is the only other candidate for continuing CYL2 reruns, so B.Ephraim will be in green with L.Lyn, which means we expect a third unit which hits res, which means HF Elincia doesn't appear.

So HF Elincia needs to appear in February with HF Xander, and at this point we start the reruns of Halloween units. It's between H.Myrrh and H.Niles, and the alternate res-hitter in red is A.Camilla, which wouldn't be too crazy either. Ryoma is a red flier (which would double A.Camilla) and Lucina is a blue bow in March (which would double H.Niles for one of the rarest weapon types in the game), so I think it's A.Camilla in February, H.Myrrh in March, and H.Niles in February sharing with Ephraim. That still leaves one slot in February's blues, and we expect someone who hits res, so it's between Ophelia, Kliff, and M.Azurcorrin. I do find Ophelia to be more likely than the other two because Nohrian Dusk will be overdue to be finished off. Nina already had her rerun and Flora is on right now. Also, it would be a little unusual for two Adrift units to appear on the same banner. (It's not the norm for units who debut together to join the same legendary banner.)

In March they will finish the Halloween banner with Myrrh, Kagero, and Mia, so that doesn't give us any clues for blue. We have Lucina and Azura, which normally means we're looking for a third unit who hits def, but the only candidate on the table that we know about right now is Ylgr and she's ranged like both of them, so I think it's more likely that we either get some unit who will be released in January or early February, or we get M.Azurcorrin, because Corrin + Azura (like current Marth + Tiki).