If Raiola had a % stake in Pogba then he received at least two separate fees. One from Juventus for buying him out of Pogba's ownership %. Another from Man Utd for the deal brokering. The club doing the buying ALWAYS pays an agent fee, I have not heard of case when they don't. Even if Juventus were to pay the brokering cost (extremely unlikely) they would just slap it on top of their valuation for the player and thus increase the total capital we pay them. We still end up paying Mino for brokering the deal, even if it's indirectly.
By the sounds of it he received £22m for his ownership % and £16m for brokering the deal. What I don't know is if the £16m is considered part of the £89m quoted for the deal as whole. Did Juventus receive, after all fees, 89-22-16=£51m... or did they receive 89-22=£67m? Did we pay a total of £89m or 89+16=£105m for the deal? Was the player's actual valuation £67m or £89m?
In either case a £16m broking fee for a transfer of either £89m or £67m in value is basically either 18% or 24% of the deal's value as commission. That's an absolutely insane overhead considering broking commissions in financial services, real estate etc. etc. is usually in the 1%-2% bracket. And those transactions are very heavily regulated from a series of bodies.
Football needs regulation, pronto. FIFA has revelled is the fact that governments and supranational organisations left them to their own devices for years. Football business has been dominated by backhanders, scandals and shoddy business practices for years and there seems to be 0 willingness from the top football body to impose reforms and structure. Even their FFP rules are a joke.