He also needed Rinnegan and Hashirama's juice to put him in that position, not to mention the Bijuu. Just evening the odds.
But he fought for it, he worked hard to get every bijuu he had, he had a death battle with konan to get the rinegan, he didnt have a working body when madara made him half zetsu so he had to train hard to get his body working, he had to make kakashi stab him so he could become jj. Unlike naruto, sasuke and kakashi they really get free powerups bruh, obito worked hard for his powerups.
He thinks that just anybody can do whatever Obito did to get that powerful.
Hashirama cells wasn't his option, it was just forced upon him.
Just the bijuus combined alone was enough to wipe out the allied forces
No not just anybody, it took a great will from obito to get back on his feet and get his body to work after madara cured him
And he collected the bijuus, he worked hard to get all those bijuus so he deserves to use them unlike some other free loaders