Why Has Ezam Re-joined Umno?

I am so curious because the former Parti Keadilan Rakyat Youth leader has been so critical of Umno, the government and Pak Lah.

In fact, Ezam Mohd Nor founded the Civil Movement Against Corruption (GERAK) in 2005, and as its chair had, (in his own words in February 2007) said:
".... I have been repeatedly lodging police reports against the Umno president [...] how can he accept me as a member? I think the speculation of me joining Umno should not arise at all."

Rumours of him re-joining Umno surfaced last year when there was talk that he had met with Umno Youth deputy chief and the Prime Minister's son-in-law Khairy Jamaluddin.

Ezam - Anwar Ibrahim's one-time confidant and right-hand man - swiftly denied these rumours and speculations which came about following his reported fall-out with Anwar's other right-hand man, Azmin Ali.

So, does it mean that he is distancing himself from those GERAK reports about corruption in Umno, the government as well as about the PM et al?
What do those reports now mean?

Yesterday when he re-joined Umno, Ezam quit as GERAK chairman though I am not sure whether he is still with the movement.

GERAK's new chairman Nazri Yunus will be holding a Press conference at its office in Kelana Jaya tomorrow.

So, what is GERAK all about then? Who did it exist for?

Ezam -- politician turned member of a civil movement, and back to being a politician.

I can't blame anyone for being suspicious of his intentions in re-joining the party he has been so utterly critical of.

An Umno leader, when asked about Ezam's re-entry, said: "I think he is up to no good alongside his buddy, KJ".

Heavy stuff that. I'm not sure whether this sentiment is his alone.
But clearly, Pak Lah and other Umno leaders are more forgiving, and welcoming. No?

What they say about Ezam's return to Umno:

"He wants to come back to Umno and he will continue with the struggles of Umno according to the party’s goal and direction, and not Parti Keadilan.
"So I accepted him." - Umno president Abdullah Ahmad Badawi.

"We cannot be choosing who we want in the party. If we do so, we will lose many people. There have been others who also bitterly attacked the party when they left, but after they realised Umno was the best platform to serve, they returned.
"It is up to Ezam to win back the confidence of the other Umno members." -- Umno deputy president Najib Razak.

"What is the benefit for Umno? Is he willing to struggle alongside Umno? What is his role?" - Umno Youth chief Hishammudin Hussein.

The stories here, here and here.