So I had a rookie WR who had a similar, but slightly worse development status experience.
Going into the season, he was going to be my #4 receiver, but then:
Week 1 - my #1 receiver went down for six weeks, the rookie moved into the slot.
Week 2 (which I simmed) - He exploded for a 100 yard day
Week 3 - He got a breakout scenario, which I succeeded at, to boost his dev trait from Normal to Star
Week 4 (also simmed) - Another 100 yard day
Week 5 - He got a second breakout scenario, which I also succeeded at, to boost his dev trait from Star to Superstar
[as an aside - thanks to all the XPs from four monster games in a row, plus succeeding at two breakout scenarios - his OVR went from 73 to 80 in just five weeks!!]
The problem - rather than immediately becoming a Superstar, instead his Development Trait became hidden. Which meant that he didn't actually get to use his new ability until the following season.