Re: weakest link regarding cables
If that single 6 ga cable is in good shape, it is not a bottle neck and your system will benefit from the overall replacement of the other cables to 2 ga.
This is one of the most misunderstood topics in this site, mostly due to applying erroneous water analogies.
Unlike water running in a hose, the diameter of a wire does not restrict the amount of current that can flow on that wire.
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