Patterson, Myko, Aznou, Dibling, McNeil and N'Diaye are our first team full-backs/wingers. That's more than 1 or 2 injuries.
We are well on course to achieve what you have to imagine was the preseason target of comfortable safety/mid-table, and potentially even Europe with a fair wind. Not signing anyone this window is not giving up on the season, it is merely a continuation of a plan that has worked satisfactorily so far.
FWIW I'd kill for a first team LB at least in this window, but I don't think we'll get anyone in and that's ok, assuming we reassess in the Summer and enact a new plan to bump us up the table that bit further. Beefing up the squad just because fans want shiny, new players to boo is potentially more harmful to long-term plans than doing nothing now.