"We're the division's form team, while no team at the top is really running away with it, suggesting everyone above is pretty inconsistent, too, and will take points off each other."
This is the crucial issue, isn't it. Over the past 15 games we're top 6 (6th over the past 15 games, 4th over the past 10 games, and top over the past 5 games). And now we've also got Cam Bran back. Of course there's no guarantee that we'll continue to play as well, but, as ttg pointed out, most other teams have been inconsistent, with only Portsmouth, Doncaster, and Lincoln doing consistently as well as, or better, than us over the past 15 games. So, much as I'd love to get a couple (or 4) new players in, there's really no reason to think that we couldn't make the playoffs even if we didn't sign anyone. Though in that case we'd need to stay free of serious injuries at the back! CB cover does seem to be essential.