I'd say it's a coincidence in part. They're there to set up offices etc as usual, but the media glare is too good to waste. Ideal time to talk turkey on the legally/ethnically dubious nature of the MayDUP fudge with respect to the GFA. It'll not be Gerry doing it anyway. My money is on that pretty new lass elected in Derry. She can carry that point, the idea that constitutional Nationalism has a new keeper (having won the last SDLP stronghold), and maybe a wee damp eye for old Uncle Marty, this isn't what he worked for etc.
Meanwhile, the DUP will be trying to cope with real investigation rather than Steroid Nolan and the Belly Telly