Well, if the context is civilian self-defense, I would rather my partner be one with a realistic and thorough understanding of the need to survive the investigation, and the legal proceedings after the shooting, as well as having performed well in previous gun battles, against real men, at close range. That elevates the post-WW2 lawmen, and Col. Jeff Cooper, to the top of the list.
I would further narrow the list to a fellow big-city PD officer, because his training and thinking might be more likely to be similar to mine. Partners work best if they use the same tactics, and each has a good idea what the other may do, in the next moment. I have a ton of respect for the Border Patrol, but their mission, though LE, is different, so their training might be quite different from mine. NYC PD training may have differences from that of Houston PD, but, I have read much about it, so, would have some idea.
I have also read much of what he personally wrote, and had a personal conversation with him at the Snubby Summit in 2005, in addition to attending his presentation.
Yes, Jim Cirillo.
I mean no disrespect to any of the other poll choices. This was a matter of picking a partner, to accomplish an apparently life-or-death goal. I would love to meet and learn from any of these men, but one quickly rose to the top as a best choice.
Edited to add: I would have chosen Jim Cirillo, even if I had not personally met him.