Could Pence be one of the leakers?

He might not even be a direct leak to reporters.
But, he could have his staff members take certain things to reporters.

I base this on:
Pence was one of the few people who would accept the VP spot.
Pence was likely not going to win reelection as Indiana Governor.
This was a forced marriage between a foul mouthed adulterer and an Evangelical.
Pence is a true believer in GOP social, economic and foreign policy.
Trump is a true believer in Trump.
The GOP establishment wanted Pence there to keep an eye on Trump and run things.
That seemed to be the deal that was okayed by Trumps family.
But, once Trump got there, he decided to play President for real.
That freaked out the GOP establishment who decided to SLOWLY bring Trump down.
They couldn't alienate Trumps base by appearing to bring him down.
So, they had to make it seem like he was doing it himself.
Pence had others loyal to the GOP and not Trump around him.
Priebus, spicer, and Huckabees daughter.
They would all much prefer a President Pence.

The big question now is: where do General Kelly's loyalties lie?
We shall soon see.