I think only Floyd beats Arguello at 130. Chavez and Pac would give him a good run, but ultimately I think Arguello is too much for them at the weight. They would beat him at higher weights.
If Sanchez carries 130 as well as he did vs Perez, I'd pick him over Arguello. Floyd is my go-to pick here, since he's the best SFW ever. Canzoneri definitely gives Arguello issues, he probably wins TBH. Like X said, Pac and Chavez are hard fights, but ETM probably takes them.
In terms of historical standing, I think it's between Arguello and May as TBE at 130. May probably deserves to be favored H2H based on styles, but I don't make him or anyone else a sure bet to beat Alexis at this weight. I could potentially see Pac beating him, but I wouldn't make a confident pick of it.