[AndrewC]

I myself am skeptical of the collision theory for exactly that reason. ... This is difficult to do within the system, as the large objects in the system won't form in such positions as to be able to kick each other out, else they'd have kicked each other's raw materials out of the way when they were in the process of forming.

Thank you very much for expressing exactly what my concern was.

[Physicist]

Thank you very much for expressing exactly what my concern was.

So now you should also see why it's ludicrous to expect that Venus has meandered around the solar system.