My opinion is that you are right in your thinking...I have an AN on a 12.5 inch Dob and I wish that the AN was mounted regularly near the focuser...
Unfortunately it is not (mine was all obtained second hand)...I do have cables long enough to let me hold the AN and hand drive but mounting it near the focuser would be better (I think). Alas, to change now would mean adding some counterweights and removing a nice brass holder...
I don't have a Servocat so can't comment on slew speed etc. I enjoy the AN a great deal by itself so I bet that the combo (AN and Servocat) would be killer...
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