Boys, everything I've seen just basically reiterates that it's about 30M for the pair, split into two payments. Udinese gets two healthy chunks, and has some purchasing power right away. Well see, but any of the terminology is going to be primarily for accounting purposes... wouldn't pay much attention to that co-own talk.
There's not going to be a negotiation for their 'other half' of these players, these are 2 of Udinese's top 3 players - and the two most desirable players from Serie A's 3rd place team. These fees are negotiated already, no doubt.