Changing NAV Partners and License Argument

Hi, we are interested in changing NAV Partner

We are using NAV 2009 R2 and NAV 2015 (new)

In 2009 we have customizations.

My questions are:

1) Can we purchase BREP from the old partner and halfway switch to the new partner without incuring any costs?

2) Upon switching to the new partner, does the customization belongs to us or to the old partner? Would the new partner be able to inherit the customization or need to develop new ones?

3) Can we forget about 2009 and start afresh in 2015?

Much appreciated