He wouldn't touch Kata for life at his current lvl lmao.
And no, there was no indication of his attack being weaker due to his conditions. The same with Tatsumaki against Hachi, or ShiShi sonson against Mr.1, or 108 Pound Phoenix against Ohm, or etc.
Same was with Sanji for example as well, and same with Luffy.
All they hit a super strong attack against their rivals and the end of the fight while being half injured, or half dead, or whatever and never was implied that they could do more damage in a better state at those final moves where they hit with all they have, like in this case.
And btw, Kaido was injured as well previously because of Luffy, so proportionally, the difference was the same.
Lame excuses of Zorotards now that Zoro didn't even put Kaido down for a moment with his strongest attack and he finished his role on the roof