But that's not the point of the thread. The OP ask what would be the consequences of Henry V dying earlier.In OTL none of them had (legitimate) children. Unless we make up some hypothetical children - and a hypothetical wife and offspring for those children - we cannot know what would come after them.
We try to answer that, with the first consequences would be the fortunes and misfortunes of Thomas and first involved, and how it would change his life : meaning maybe hypothetical child.
Furthermore, unless you believe that History is only about individuals and that if their life is changed, nothing at all would be the same, I would tend to say that's an extreme take on butterflies for the sake of not doing actual AH.
There's thing as historical tendencies, social situations, ressources, historical limits, etc. Of course an hypothetical *Henry V as son of Thomas I would change things, but not the power balance, the greater lines. That was interest me, and some other participers to this thread rather than a tideous and almost unaltered list of kings.
I KNOW there are many other options, but unless we sit down, change every single monarch in the history of all monarchs and marry them all together, we cannot know the descendants of Thomas, Humphrey, etc. Thus, we go for one that can work and is easy - Blanche.
But what would we want absolutly to have a TL up to nowaday?
Critically if the only way to reach this is : "Well, of course there would be butterflies after this PoD, but couldn't we assumes nothing really changes? It would make a great alternate timeline!"
I don't see the point of doing Alternate History if it's to stick it with absolutly but anecdotical changes for the sake of it.