Well Bee was mostly training Naruto how to control his KM power. Before, Naruto would smash boulders in his chakra hands just by trying to hold it. Naruto's training was incomplete since he left to join the war and Bee called the war hands on training.
1. That doesn't really matter when SM gives Naruto the physical strength to stop a charging rhino summon and throw it high into the air and 1 hit one of Pain's body which was beating chunins and jounins. KM Naruto smashed a boulder in his chakra hand just by trying to hold it and that's when he had a portion of Kurama's chakra since Kurama said the cage limited the amount of chakra he can give Naruto as well. So SM+BM should have strength greater than Bee and A put together when in his current state.
2. Wind cuts just like Lightning and would beat lightning if they clash. Also Lariat doesn't use lightning, you can apply it if you want but it's not strictly required since Bee used it without lightning lots of times and it's just A in his lightning armor that does it