Assume nothing.

The Autosomal results are coming in fast and furious. Apparently faster than Ancestry's database routines can manage properly. I have numerous "matches" that show a leaf and a MRCA but the results are false. The child of the MRCA in the other tree won't even have the same surname as either of the proposed parents.

I have a number of others that are matches and both trees share a MRCA but the "Has a Hint" filter doesn't catch them.

Like I said, assume nothing.