NOT REALLY MISSING IN ACTION-1972 RICH HACKER

Here’s a “not so missing” 1972 card for 16-game Major League shortstop Rich Hacker, who played for the Montreal Expos during the Summer of 1971:

Originally drafted and signed by the New York Mets in 1967, he finally made it to the Big Leagues in July of 1971, collecting four hits over 33 at-bats with a double and two runs batted in during his short stay.
He’d spend the next two seasons in Montreal’s Minor League system, then oddly, though I have NO record of him playing Pro ball from 1974 to 1978, it shows that he played for the San Diego Double-A Amarillo Gold Sox for six games in 1979. Odd.
Anyone know what went on here?