Not really. Lol
There is nothing hinting prime Rayleigh is stronger than Blackbeard. Rayleigh fans did this with Kizaru too, “Rayleigh said he wanted to do more, that proves prime Rayleigh > Kizaru!” No, no it does not. Lol
Prime Rayleigh is probably still weaker than current Blackbeard. Prime Rayleigh negs Shanks though.