are you a freaking idiot? lets say tobirama never invented the techniques that they use, minato and naruto would learn other techniques. do you honestly think events in the manga would play out as normal heck no. i can say the same for other characters sasuke owes his chidori to kakashi who invented it he also owes his sharingan to his uchiha blood so if he wasnt born uchiha he wouldnt have sharingan and he owes ems to his brother.
and what are you trying to get at, are you so desperate that you have to downplay characters because they use somebody else's jutsu their is only a couple of characters who have original techniques and even they use techniques developed by other shinobi