All depends on his role. If he's a "backup", but he's playing 30+ mpg backing up two positions, it could absolutely make perfect sense.
I was torn between Aminu and Vonleh. Aminu will be a very good defensive player for us, whereas I think we'll see a quite a bit more from Vonleh offensively. Charlotte will eventually view him as their Jermaine O'Neal. I went with Vonleh in the end, but I will certainly be a happy tiger if Aminu comes out like a defensive force!
Interesting point. The Aminu signing reminds me a lot of getting rid of Rolo to overpay a mediocre player, and then spend all your space on Asik.