Pogba does what Busquets does?
What?
Busquets is best known for his defensive qualities - tackling, intercepting, reading/awareness of the game, breaking up attacks and disrupting opposition play, off-loading the ball simply.
For most of that (all but the last point), I don't see Pogba doing that at all.
Looking back at last season, he made 47 tackles across the whole season. https://www.premierleague.com/stats/top/players/total_tackle?se=274
Regarding your first sentence, he doesn't do way more than any PL midfielder. Laughable claim with your red-tinted glasses on. No issues with claiming he can score and influence goals/chances but to claim he possesses some world-class defensive quality in addition to that is just ridiculous.