Since Edward Howse had no heirs, why did he only mention Arnold and Alexander Windsor in his will? There were several other Windsor children he could have added.
I would like to see the will. You say you live near there, perhaps at some point you might go to the courthouse and get a copy of it.
Here's another suggestion for you:
I've heard there was an old Windsor burying ground where Thomas Windsor, wife Catherine and supposedly the father of Thomas, another Thomas Windsor, and other family members are buried. Keturah Windsor Waters mentions going there and seeing the graves, tombstones and epitaphs. I believe she stated the cemetery was on the old Thomas Windsor family farm inherited by his son Henry Windsor and then by Henry's son William Robert Windsor who supposedly sold it about 1900.
I wonder if that old cemetery still exists? Maybe since you are in the area you might find out? That would be great.