Ask yourself how many players Chelsea and Liverpool signed in January. Yet Wenger signed three. You can't just go and signed players for the sake of signing them because it is the transfer season. If he signs that way Arsenal will become like Chelsea where good players fail to get enough games.
Another pint is, it took years for Wenger to develop Arsenal's style of play. If he were to make wholesale changes at a time, the culture would be lost with himhaving to teach it again. Instead he gets a few players in at a time and gently eases then in. That way they adjust to Arsenal style of play
You can see he feels his team is settled and he gradually strenthens were necessary or where some vacates. Loaned out players coming back like signing new players. As is the same with injured guys.
He himself said Arsenal are no prisoners to names. So he doesn't sign just because of the names. He looks for real talent that can fit ourstyleof play. So far, he has be successful