You literally just talked about him fighting Crawford.Meh. He dominated both Pedraza and Crolla, and I didn't see Campbell decisively win a single round. The fact that Linares won maybe 3 rounds speaks to Linares' talent and speed rather than Loma having showing a big decline. While Linares is not durable he was always talented and had explosive power, I think he brought certain attributes to the table that produced that knockdown.
I would say Lomachenko is basically every bit as impressive as he was in the past, he is just slightly older now and at a higher weight class. There is this expectation among some boxing fans that Loma has to move up and up and up in weight in order to prove his greatness. Yeah, nah. I think Loma has reached his limit in terms of weight jumping.