Hi Victor,
The issue with remote AP's controlled by ZD is that the ZD actually handles association and the WPA 4 way handshake - so if the ZD is not available clients cannot associate. If latency is over 100msec then client association will also be affected. It also handles all captive portal, MAC or 802.1x authentication.
Unleashed does not support 7372 AP's - you can verify supported AP's from the Unleashed Release notes:
In general - Unleashed version of code (200.x) can be freely downloaded from the Ruckus Support site but it is only available for newer model AP's.
I hope this answers your questions.
Thanks for choosing Ruckus Networks products - a Commscope company