Mariners had a very cancerous clubhouse in 08', and it was Griffey who changed all that in 09'. Mariners had the biggest improvement in wins from the year before.
The 2008 Mariners boasted an infield of Miguel Cairo (OPS of .646), Yuniesy Bettencourt (OPS of .691), Jose Lopez (OPS of .764), and Adrian Beltre (OPS of .784). Their starting outfield outside of Ichiro had an OPS of .610. Their DH for the year, Jose Vidro, had an OPS of .612. Plain and simple, their offense was the definition of horrid. One person on the entire team had an OPS over .800 (the league average for the year was .745). The 2009 version had an infield of two returners and two huge offensive upgrades, and the outfield had a similar upgrade. The team went from an average OPS of .670 to .740 not because of anything Griffey did in the clubhouse, to put it bluntly, they got better because they got rid of the players that sucked.