He needs more space because of his different characteristics.
Time will tell how far his talent can really go, most probably not in this slow and sluggish Barca team though.
height - Yes, Maradona, Messi, Romario, Franco Zola have lower center of gravity.
Dembele is 1.78, but it seems Neymar with 1.75 has no problem of gravity, nor had Zidane 1.85, Ronaldo Nazario 1.83, Ronaldinho 181, .... so maybe there are also advantages that outweigh this, or -> it does not really matter much.
Firstly I don't think Dembele would be 1.78, probably it's just a press-typo or something similar, he definitely looks not less than 1.8x
Secondly he has proportionally long legs, which places his C/G even further up.
When you look at his touches when dribbling, you can notice that almost all his touches are sort of ignorantly soft, this is how he's trying to keep the ball close to his legs, but at the same time this is also the source of his mistakes.
Nevertheless he has very good dribbling talent, something that only a handful of other Barca players can claim, like Semedo a bit, Busquests when he is not in snail-mood, actually nobody else in the team, of course apart from Messi and perhaps Fati, but it's too early to tell.
That's why it's nice to see him sometimes, when majority of the team are not good dribblers.
His two-footedness, pace and dribbling capabilities alone would make him very promising. Let's see.
Right Stuff
More of this please!
Less of this Please 
