Everyone.
Over the last three years, Chen has averaged 171 IP of 3.61 ERA, 1.24 WHIP ball, while Buchholz averages 131 IP of 3.74, 1.23 WHIP ball. Those 30 extra IP yearly coupled with much higher consistency (Buchholz had one superlative year, a s***** one, and one above average one, while Chen has one slightly below average and two slightly above average ones) definitely tips the scales in Chen's direction. I agree that Chen would not have been the savior Dojji paints him as (it's his MO when he covets a player), but let's call a spade a spade. Chen is a more dependable, consistent pitcher than Buchholz.