Sounds like one heck of a day!
I would say your partner’s luck has more to do with you presenting the same lure to the fish, in most cases, before him. Typically if I was fishing from the back of the boat, I would throw something different than the person in the front of the boat. If you’re cranking it can be tough to fish a worm, jig, shakey head, etc. but if the opportunity presents itself that can be a good option to trigger a few baits that a power fishing tactic won’t. Otherwise, if the fishing was too fast of one of the aforementioned presentations, I’d throw a spinnerbait, chatterbait, topwater, swim jig, hard head, etc. and probably get a couple baits from fish that weren’t interested in your crankbait. At the very least, I would throw the same lure but in a different color. Just my two cents.