Leonard had Teddy's company when he killed the first John G..
when he kills Teddy he will naturally have an internal reaction as there is no external vent..

i don't think Leonard is consciously aware of his elaborate self defense construct built to get rid of Teddy
..subconscious awareness? maybe..

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Smart reply. I like where you are going with this.
What if John G. tricked Leonard into killing the wrong man in his first murder?
Then the evidence would point more to John Gammel.
After all, where did he get the amphetamines to convince Jimmy that he could get 200K worth of them?
Every deal includes samples of some kind.