I've considered Loma an exceptional pugilist since he was an amateur. And if we base our anlysis objectively on their respective records, so are Floyd and Rigo. In fact, if there is a style that could potentially nullify Loma's tactical paln in the ring, it'll be Floy's and/or Rigo's, but only if they were in their prime.
The fact of the matter is that Loma superiority depends on the speed in changing an initial frontal attack (which is just a misdirection maneuver to hide his true objective) to attacking the left-flank of the opponent. Napoleon use similar military tactics but in reverse,order (attack the flanks first, then the center after the enemy reposition troops from the center to the flanks).
However, Floyd (exceptional) shoulder roll and peripheral vision have the potential to render Loma's tactics with diminishing return; in addition his wide stance will mean Loma would have to pivot over a larger semicircle (reducing the effective speed of Loma's attack).
Rigo (and sweet pee) also pivot to their left, but not like Loma. Loma move his leading right foot first, so as to block the left of the opponent, and follows with straight right and left upper; he move away and to the right... and repeats. Whitaker and Rigo, move their supporting left foot firt and then pivot over their hip (that the reason why they seems to basically squat). They have similar movement to scape to the left. Rigo was able to do some of this in the 1st round, but he was already a bit slow for Loma.
Yet, none of this equates to Loma losing to Floyd, Whitaker, or even Rigo in his prime. For example, Cotto had relative success against Floyd because he attacked Floyd from Loma's preferred flank of attack for a conventional boxer.