I just found this which seems to indicate that he can
not be brought back since he was placed on IR before September 1st... officially they placed him on IR on August 31st from what I can tell. So essentially they have to make the final roster to be eligible to return via new IR rules.
In a Tuesday memo, the NFL notified all teams that they are permitted to have unlimited players return from the injured reserve list this season after missing three games, Tom Pelissero reported. Only players on the 53-man roster after Sept. 1 are eligibl
www.nfl.com
Only players on the 53-man roster after Sept. 1 are eligible to be designated for return from IR or the non-football injury list, Pelissero added.