Is captain jack harkness the face of boe?

It is entirely possible that this could of happened

after all rose absorbs the tardis' energy and uses it to bring jack back to life.

the face of boe could be a further stage of evolution to jack and this could mean that the ace is existing on only the tardis' energy and is close to death as the energy will only last for 5 billion and 53 years.

overall i think that yes jack is boe 

but is he the only big head being out there?

afterall rose might have raised others when she raises jack from the dead so is he alone?