He is taller than kakashi wen thy are kid
.if obito is 30 nw thn he would 14 coz when kishi started naruto he mentioned 12 years ago a nine tailed fox blah blah then that time naruto age would be 12 at now naruto age is 16 and obito is 30 then 30 - 16 is 14 so i am sure obito age at fox...
Also dont forget that madara stated that obito not capable of becoming shinobi with tht half zetsu body so having half zetsu body made him weak but gave him more chakra and power
You want to read manga again zetsu half body is very weak when obito hit the rock hiszetsu hand was broken so u say thAt rock power is equal to rasengan power i say no ,his half body is very very weak than his normal half this is stated by spiral zetsu so only he wrapped obito body to fight...