Nothing hypocritical about what Leon said. He said he would fight Belal no problem. His coach saying Burns is a better fight isn't wrong. Belal is another version style wise of Usman & Colby. Wrestle heavy boxing style. Burns is a more exciting and more well rounded opponent. Leon also already fought Belal and he was dominant (Not that it lasted long).
Leon vs Belal will happen next unless, as Chael theorized on the MMA Hour, there was something amazing for Leon and the WW title for UFC 300 that wouldn't involve Belal. Chael speculated Belal's next fight will be for the WW title but it is possible it won't be the next WW title fight. Only thing I could imagine would be Conor vs Leon, Islam vs Leon.
I expect it will be Leon vs Belal at UFC 300. Probably Co Main with Aspinal defending the HW title and McGregor vs Chandler???