Probably -- it gives Trump some links to mainstream politics in a way that might grant him legitimacy (aling with his commanding poll figures).
But it's a disturbing and glaringly cynical move by Christie. Barely two or three weeks ago Christie, campaigning himself, described Trump as having "not the first clue how to run a government", an "entertainer-in-chief", and with "make-believe" policies, and advised people to "get off the Trump train before it is too late".
What changed in the last two weeks? Only that Christie was losing, badly. Now, like some kind of twisted glory supporter, he's going to attempt to pretend that he was siding with Trump all along. It's gross and cynical, and shouldn't be looked on as anything other than a desperate attempt to sneak a powerful job in Trump's potential cabinet.