Honestly can't saying that they are vastly weaker than any character at this point be called speculation because for one we have yet to see zoro in a serious fight since his training ended let's be honest the guy has been basically testing out his techniques fishman island he was throwing random attacks given there where 50000 men still you get the point punk hazard they found a dragon he decided to test his skills against a dragon and still didn't get serious fighting it given it was an artificial dragon you get my point and even on dressrosa he got upset at luffy for not telling him about the Colosseum fights and I doubt he was serious against pica annoyed but not serious and the same goes for killer, pre-time skip we barely knew anything about his skills do you really think he isn't at the least close to zoro after the time skip I mean they are foreshadowed to be the SH's rivals at sabody I think and Kidd is looking for one piece and trying to be pirate king so like luffy he would only recruit the best where they are from so we can only assume and speculate and I feel as if zoro already has the reaction feats and speed to block and/or dodge doffys strings and assuming every main member of the Kidd pirates has someone to match with a SH pure speculation I add killer would also be able to preform similar if not the same feats as zoroso sanji who specializes in Coo couldnt c it until it was 2 late why would zoro or killer.. same with jozu
not to mention fuji should have incredible coo simply cuz he is blind the feats of an admiral level person should not be compared to someone like zoro or killer who is vastly inferior ......
also like the other guy said he has his cloan to helo him and awakened df with superior haki and speed durability endurance etc
neither of these char has ever done anything significant on the level of gamma knife or gear 4th both which were key elements into taking down doffy