In '95 no one had any idea what Mariano could be - he was an ineffective starter at that time and didn't have his magic cutter yet. Though not Mariano, Dellin struggled until they put him in the pen/ In 2016 Severino was a mess as a starter but star in relief - but look what he did in 2017.
But as for analytical manager, they're taking all the fun out of baseball/ Why bother playing a game - just plug your lineups into the computer and let it give you the winner. They're just going too far with the numbers and removing the human thought process - it was so much fun watching good managers match wits