I like Rumman, a LOT and supported his inclusion as a role player in the squad packed with dead weight and batting PP liability. But let's not get carried away here.
He has immense potential in terms of natural ability, but that potential needs to be nurtured into talent, and then the talent into consistent performance.
Those of us who have actually seen him bat with our own eyes can make more qualitative remarks about what he does with the bat. Decontextualized statistical geekfesting, coupled with intellectual dishonesty and desperate, wishful thinking can do a young player like him more harm than good psychologically.
As stylish as he is, he has issues. He is hot headed, and prone to brainfarts and subsequently playing absolutely horrible shots he won't get away with facing quality opposition with quality bowlers, period. Take a good look at the Asiad video posted here. He needs to be nurtured in the A Team, our T20I squad, and if necessary (as it was during this World Cup) as a role player in the ODI side.
Shubhagoto Hom and Fazle Rabbi, both aggressive, are significantly better batsmen with better temperament and technique. They can also hit out just as spectacularly. Hom is 23 going on 24 and needs a series in the senior side to try and show what he's capable of before either Rumman or Fazle Rabbi.
"And do not curse those who call on other than GOD, lest they blaspheme and curse GOD, out of ignorance. We have adorned the works of every group in their eyes. Ultimately, they return to their Lord, then He informs them of everything they had done." (Qur'an 6:108)