10 reasons not to use to make someone (project?) manager

He was there from the start of the project.

He is the oldest guy in the team.

I know him personally.

He is technically good, we have to promote him.

Hiring a manager from outside is a lengthy process.

He likes football like me.

He says he used to manage projects in his last job.

He has some good ideas but doesn't know programming.

He has been a developer for a very long time.

We just created this new group and we need a manager quick.