I'm wondering if "would" is used properly in the following, or "will" should be used instead.
A: Where's John now?
B: I don't know for certain. He would be at home now.
A: When will John come back?
B: I don't know for certain. He would be back by seven. / He would have come back by seven.
I'm thinking about Merriam-Webster's definition:
9: COULD the barrel would hold 20 gallons
10: used in auxiliary function to express doubt or uncertainty the explanation … would seem satisfactory