First, I talked about why Jaime is 200% alive in my recap this week (there was an obvious and somewhat sloppy tell). But also, just as an aside, while I agree with you that Jaime may end up turning against his sister (not least because she would probably eventually turn on him and have him killed given recent events) it seems unlikely to me that Jaime would think that Dragons are an unbeatable weapon after the events of the battle (Bron, but for understandably shaky aim) could have killed and not wounded Drogon and with some Qyburn modifications, the giant crossbow isn’t a terrible response (Wildfire tips anyone?).