The death certificate is confusing because it is registered in March 1927, however in the column where it says "When and where died", it appears to say March 1917, at Stream Road Kingswinford, where the workhouse was situated.
If he did die in 1917, but for some reason wasn't actually registered until 1927, then it would answer a number of questions. But I do not know if this actually happened.
His wife, my great grandmother remarried in Manchester in April 1917, have the marriage certificate.