Too late for that, the matchups been added already. Secondly, this is 9-B+ key of Saitama and he's subsonic on that one.
Mikey doesn't have marksmanship or any ability which suggests that he can actually fire at good speeds from 100 meters, which is a big distance. Getting close is also a gamble, for Mikey, because Saitama has godly pain tolerance.
Kachon's
accepted calc has Saitama traveling that distance in less than a second already. Attack speed for Mikey is higher but he doesn't have the same reaction speed, he would be at Saitama's level for that just. Firing a gun would take around
1/20th of a second even if Mikey was actually a good marksman which he isn't.
And also, stop blaming someone of making threads out of spite. I am pretty sure Zetsu doesn't even participate much in TR downgrades and this was completely unnecessary and uncalled for.