Cannot argue with your point of the potential difference one more Matt Barnes statistical twin would have made in the current record. That hypothetical pitcher plus Barnes in the 7th inning when a comeback is still possible, plus Workman could have salvaged a few more wins, maybe several since the others would be less used. Hembree may have been trending that way, and I suspect his loss for however long was somewhat a nail in DD/Cora's coffin re the BP. That and not one guy from Pawtucket who you can say made a real difference either by effective inning count or results.
I'll give Mike Shawaryn a pass on some decent numbers to date but only over 11.1 innings, but no decisions, no saves, not any real late and close PA's, looking at Moon's table above. yet