A fight against Thurman would be great, and I think Thurman will win and that would make him one of the top contenders to fight the champion. Imagine, if the fight of Spence vs Crawford will not happen, then we can still see Thurman fighting one of them if the promoter will agree.
People should not hype Ugas just because he won against Pacquiao. Even I'm not taking any excuses why Pacquiao loses to him, the people's champ is not at his 100% on that fight both physically and mentally. If he will return to ring and fight Thurman, his winning rate is low. Thurman even coming for a long break doesn't have any distractions on his mind when he return to ring.
For sure once Ugas and Thurman face each other, Ugas might now finally retire as Thurman will pulverize him. No offense to Ugas.