In terms of "in-season" effectiveness the workload did not appear to have hurt him so I can see why he was worked excessively by Cito.
But his career effectively ended at the age of 29. In terms of career longevity that workload between 1988 and 1992 may have well did him in, especially with his breaking stuff. And that is the workload impact I am referring to.
- Ward pitched 127 innings out of the pen in 1990.
- No reliever after 1990 has pitched more than 113 innings in a season (See link below). He averaged that amount over a 5 year period between 1988 and 1992.
Most Relief Innings Pitched In A Season By Reliever Since 1990 | StatMuse