I added an obituary to the profile. As Norman says, the pension index card indicates that he did receive a pension. But the obituary says that he didn't. Since he applied for a pension on 3 September 1883, and died in June 1885, I wonder whether the certificate was issued after he died. Sometimes getting enough evidence to satisfy the Pension Bureau took a long time.
The Act of 6 June 1866 includes this section:
"'SEC. 6. And be it further enacted, That if any person entitled to an invalid pension has died since March four, eighteen hundred and sixty-one, or shall hereafter die while an application for such pension is pending, and after the proof has been completed, leaving no widow and no minor child under sixteen years of age, his heirs or legal representatives shall be entitled to receive the accrued pension to which the applicant would have been entitled had the certificate been issued before his death."
So if he died while his application was pending, and the certificate was granted after his death, his widow was entitled to the money he would have received.
For your #4: the original pension act (14 July 1862) granted pensions only to children under 16. The Act of 27 June 1890 extended that a little: 'That in case a minor child is insane, idiotic, or otherwise permanently helpless, the pension shall continue during the life of said child, or during the period of such disability, and this proviso shall apply to all pensions heretofore granted or hereafter to be granted under this or any former statute, and such pensions shall commence from the date of application therefor after the passage of this act:'
So, no later descendant would have been eligible (as far as I know).
Harry