Yes but none of those players had question marks regarding where they would actually be playing (at least, I don't think so). Even with Vermaelen who was a LB at Ajax, there was no mystery that he would partner Gallas. I think Vertonghen's flexibility might actually be a hindrance to him, unless he's willing to be a utility player here instead of a first XI starter at an equally big club.
At CB (apparently his best position), we have 2 clear options ahead of him (as much as you don't rate Vermaelen he is clearly a massive leader and influential figure and isn't getting dropped) + a big German on big wages that we just signed last season and who started showing signs of being accustomed to our play before his big injury.
At LB, we have a Home Grown player that Wenger clearly rates, and Santos who we just signed.
At DM, well... the midfield is the big question mark going into next season.