I don't know how to rank Embiid or Wiggins but those would be my top 2 with Parker number 3. I liked Parker the most coming into the season because I thought he was ridiculously skilled and an above average athlete. Besides the opening games of the year, his athleticism hasn't impressed. He's had a nice few dunks but generally, he's looked slow off the dribble and then slow getting into his shot. He's gotten blocked a lot and a lot of those blocks have been complete obliterations. That's concerning at the college level. Further, his jump shot has been very spotty over a long stretch of games. His percentage on jumpers off the dribble has to be very low.
Of course Parker might be a different beast with better conditioning but Wiggins and Embiid also have lots of room for improvement as well.