Horn2Run if the pitchers were being over used I would agree with you. Of the lot only Lewis could approach to have been over used early in the season.
Fleliz does not have the body, mindset (he cannot shake the 9th inning of Game 6) or pitches to be an effective starting pitcher over any period of time. If Holland cannot eat innings he should not be on the staff as every time he rolls out it is a 50/50 chance of which Holland will be taking the mound. Ogando petered out late last season and has not shown consistency as a reliever this season.
The pitching future for the remainder of this season seems to be Lewis, Darvish, Harrison a plug in backed by Ross, Adams and Nathan.