Henry Armstrong for sure. Potentially JC Superstar. Both have styles and skill-sets to allow them to stay competitive with Floyd, at any rate.
Tough to say. At 130 lbs, he had a very good blend of size, speed, power, reflexes, handspeed, defense and athleticism. He's never been a 1 punch KO artist, but he packed enough pop at that division to hurt guys, and when he had them hurt he'd usually close the show and not cruise to a decision. He went 27-0 with 20 KO's at 130 lbs. I can't think of anyone who actually campaigned at 130 lbs that I'd favor over him. Maybe a fight with a 130 lbs DLH would be close. I think he would've beaten some of the great 130 lbs fighter of the 80's like Azumah and Arguello. I also favor him over Chavez sr.
And what you fail to mention is they were no match for Floyd which indicates Floyd is much better than his best available competition
For the love of God, let's not start overrating Loma. Floyd would beat the **** outta Loma at 130. This isn't ****in Gary Russell we're talking here! Camacho would beat Loma at 130 as well.
