Madara has Creation of all things.

[Young Vongola]

And 0% blood of uchiha flowing through his vanish :|

How is having eyes from an Uchiha on a Senju descendant any different from putting a piece of skin from a Senju on an Uchiha?

They both combine Uchiha + Senju DNA/powers

 

[VongolaX]

How is having eyes from an Uchiha on a Senju descendant any different from putting a piece of skin from a Senju on an Uchiha?

They both combine Uchiha + Senju DNA/powers

Who said they put on skin?

Did you not read?

Uchiha blood, simple

Otherwise we would be seeing sharingan comas on Nagato.

Zetsu is also senju DNA with a blood type B.

Madara didn't take some skin and put it on his body, Hashirama's body has been tampered with constantly.