The Anthony Mason comp is one of the best that I’ve heard, much better than the Draymond comp. Small forward height, power forward build, big, skilled hands and excellent handles. Also, great footwork – you seem to be referring to foot speed here, which is something else. I'm a little annoyed by the "Dancing Bear" nickname - but it does encapsulate his unusual combination of size and foot dexterity.
At present, he is nothing like Anthony Mason. He is not a solid rebounder. Here are Mason's career averages:
PTS 10.9
TRB 8.3
AST 3.4
Note that he is a good rebounder and passer.
https://www.basketball-reference.com/players/m/masonan01.html
Yabusele has not demonstrated skill in either of those areas to a high degree.
https://www.basketball-reference.com/players/y/yabusgu01.html
Your per game stats don't make a good comparison, even if we weren't comparing Yabu's spot minutes as a rookie to Mason's entire career. Yabusele is averaging 5 minutes a game.
As I said, the sample size being small, the rebounding numbers for him are encouraging.
In order to compare "apples to apples", I'll use rebound percentages.
Mason (career): 7.4% Offensive/20.1% Defensive
Yabusele: 12.2% Offensive/18.4% Defensive
For further comparison, Yabu is about where Horford was last season, and Mason is about where Olynyk was - for defensive rebounding.
The sample size is tiny, but Yabusele's offensive rebrates are very encouraging. If those can translate to a larger sample size, it's another bullet point in his uniqueness.
Here's points per 100 possessions:
Mason: 16.7
Yabusele: 17.7
As I mentioned above, a guy who can put it on the floor and shoot with range really needs to get better at making plays. That is definitely a growth area for Yabusele, as I said, along with other aspects of the team game on both ends.
The basis on which I made the comparison was overall build combined with great footwork, hands, and handles - rather than any particular statistics. Apart from the difference in age beginning their NBA play and the obvious fact that it's dubious comparing a rookie's play before the all-star break to a whole career, the game was different in Mason's time, both in terms of the rules and in how the game was played.
Yabusele is 22 and has played 110 minutes. Mason played his 130th minute at age 25.