I had the same concerns, but watching him closely over his past few games he still looks to be quick enough over the first 10 or so metres and still looks to have good lateral movement when defending.
When you consider how many players we have that are turnstiles in defence as our right centre, he could be someone who could plug one hole for us defensively at right centre.
This being said, I think he would suit us best as our right edge back rower, but sharing the role with Seyfarth coming off the bench.