You don't need to log in for whole month if you don't want that ninja nor do you need to do myoboku if you already have that ninja too.

Im on older server but I missed last time Naruto xy jutsu was there so them giving him again let me to finally get him.

They should probably remove all ninjas from myoboku or monthly sign in because somewhere at least 1 guy already has that ninja so they shouldn't give them at all.