Ainsworth would probably be a good player if we could afford a luxury like that. Imagine he'd be most effective with us as an impact sub when we're needing a goal.
If he's back at Plymouth already I'd assume the management don't rate him enough, and I think it's safe to trust their judgement.
We also had (not sure if we still do) Nathan Oduwa on trial, he was part of the Rangers team that won the Championship, although his loan ended in January. Think he's a winger so wouldn't make too much sense to me unless we're seeing him as a striker. Could still do with another body up front in case we get any injuries, whereas signing him as a winger would give us 9 who would play out wide (Lamie, McMillan, Lawless, Cadden, Lawson, Burns*, De Vita, Menga, Oduwa).
*Can't remember if his loan is up this month or if we've got him all season. Regardless, I'd rather a defensive player if we're signing another winger unless they can make a significant change in our attacking play.