There's lot of ifs and buts!
None seems to notice one big wrong decision from 3rd umpire Erasmus!
Ishant given 'not out' by on-field umpire. On England review, 3rd umpire must have definite proofs to overturn that (as per DRS rules). But there was a prompt spike on ultra-edge when ball passed the bat. So, the on-field decision of not-out should have been stayed.