Not necessarily. I could see why Golden Boy would want to make a Pacquiao-Ortiz fight, but why would Arum?
Let's say Pacquiao-Ortiz draws a total of $65 million and that $10 million goes to HBO/Showtime for putting on the fight and $5 million goes to the MGM Grand for hosting. Split 50/50, that's $25 million to each promotional company. Pacquiao would get his share of around $20+ million, meaning Top Rank as a company only makes around $5 million.
Now let's say Top Rank signs Tim Bradley as a free agent and they do the same amount of money, and HBO/Showtime/MGM Grand gets their $15 million cut. That's $50 million that goes directly to Top Rank. Pacquiao gets his $20+ million and Top Rank makes around $30 million.
Just for argument's sake, let's say a 80/20 promotional split for a Pacquiao/Ortiz fight (the lowest GBP could go if they want to make any money off the fight), Top Rank still only comes away with $20 million. $10 million less if they just went with another option that could bring as much money.
There's a reason why Arum only puts Pacquiao against Top Rank fighters or free agents that aren't tied to a promotional company. They have the golden goose and it would have to be a special fight (namely, Mayweather) for them to share him with anyone.