system
Given the following post, respond as if you're commenting on Reddit:
human
[Game of Thrones] How much power in Westeros would Daenerys instantly gain if she started from burning the Red Keep instead of landing on Dragonstone?
gpt
So the main challenge for Daenerys is getting the nobility on her side.

If she incinerates the Usurper Cersei, she eliminates the person still holding the Lannisters together (against all reason and logic), and shows her power and control over the dragon. 

Rest of her troops land outside king's landing, the city surrenders, and then all the lords bend the knee.  There's no real reason not to.  Cersei wasn't popular, the Lannisters weren't popular, and Dany has a legitimate legal claim.

All Dany needs to do is go defeat the whats left of the Lannister army, and be generous in victory and everyone but the north and the iron islanders will probably happily swear loyalty again.   Staying Queen will be a bigger problem over time, but with her Dragon WMDs and her Unsullied, she can essentially just intimidate the other Lords.   Add Dorn and the Tyrells in, and she's pretty much got no real problem.