I don't think Barker has answered questions about his stamina. He hasn't had to work at anything beyond the pace he's set. Aside from some rough housing. Barely been hit clean either. He's comfortably good enough to dispose of Macklin but world level will be tough due to his lack of power. He could beat Sturm though.
I told everybody. "Spada is awful to watch". Everybody said "Oh no, he's world class and will give Barker fits. He even gave Zbik fits. The great Zbik! This will be the FOTY!" :verysad
Barker's lost a bit of his neatness in these last couple of rounds. He's falling in with his punches and allowing himself to be tied up. He's lost that nice spacing. Still winning the rounds, but losing the chance of a spectacular stoppage.