Except points are a kinda "meh" way of showing skill. Having the most points doesn't make you the most skilled player. Perhaps the custom game screen could have a box to determine the CPU difficult on connection loss (only shown when advanced options is toggled), but even then, it seems a bit overkill and/or possibly controversial.
Also, if we're ever able to re-enter games after loosing connection, the cheating resource multiplier on higher AI levels could be problematic when players return to a very high resource count.
On another topic, though, perhaps an ultra difficulty AI should be the default for replacing players. The reasoning is that most average-ish players should be able to defeat or be roughly equal to a CPU-ultra in a one-on-one match. And even for the beginner players, the slightly more efficient AI replacement would probably make up for the fact that you can't strategize with your team mate (which seems to me like a huge detriment).