The triggering of Vance's powers so much earlier than had originally ocurred means the 31st Century Guardians are already in a divergent timeline.
That and the fact that Young Vance later became Marvel Boy, joined the New Warriors, killed his father in anger for a long history of physical abuse, was tried, sentenced, served time, took the name Justice and then after being zapped back in time by the Sphinx, discovered the fact his Dad had resented him to the point of abuce partly because his Dad was actually gay at a time when coming out was a lot harder than it is nowadays.