Forgot i had a finished AI/RC beetle that is gimped ( the base damage dropped from the max to the next lower lvl for some reason). Any way as him and my 4 slot have the same base damage i thought it would be easier to make a comparison. There was of course a couple problems as my 5 slot AI/RC had 120 wrestle and the 4 slot RC only 110 as well as my 5 slot having higher tactics and anatomy. As i recall a +10 points in wrestle should give a 25% increase to hit, and add in the extra damage from higher tactics and anatomy a 15% increase approximately. So my 5 slot should have a DPS( damage per second) average of 40% higher than my 4 slot.
Was using swoop as a testing agent, now basically it should take appox. 7( for 4 slot) seconds for every 5 seconds(for 5 slot) to kill swoop. which would mean they would be doing the same DPS after accounting the variance in wrestling, tactics, and anatomy skills. It was actually a 8 to 5 ratio when i tested however i forgot to account for swoops hp regen(doing the extra time it takes the 4 slot to kill swoop) so after rechecking the numbers the DPS was almost very close to being the same. note there are a lot of factors i did not account for(like swoops wrestle) as i just assumed an average over time and number of swoops killed and of course it would take too long to do accurately in any case so this is just a rough estimate from the numbers i got.
First thing i observed is my 4 slot would use RC back to back and sometimes wait 30-60 seconds, although he was never close to being out of mana( my 5 slot never ran out of mana either), so i would say it is highly unlikely that there is a cool down period. Rather it seems like a weap hit spell where there is a percentage chance of using(going off) or something similar.
As i note,(after taking into account the disparities between the beetles and the swoops HP regen) the DPS was close to identical, which would mean that having AI and RC did not give any extra damage( the average damage over time) as having RC alone.
However the mana use was different as the the 5 slot AI/RC was using approx. 85 mana per minute of combat and the 4 slot was using approx. 23 mana per minute( past what they could regen) also noting that the 5 slot has about 4 moore MR than the 4 slot.
So after testing and coming up with these rough estimates, if you are looking for DPS and conserving mana then i would not advise putting AI and RC on same pet.