How did the Royals do before and after Mike Aviles became the regular starter in stead of Tony Pena at shortstop for the Royals?

Question: How did the Royals do before and after Mike Aviles (.325/.354/.480) became the regular starter in stead of Tony Pena (.169 /.189/.209) at shortstop for the Royals?

Why I asked the question: Actually firesticks from the the Royals forum at Scout.com asked the question:

“Any idea what the run differential was from June to the end of the season? Basically when Aviles became the starter? I think that'd give us a better idea seeing as Pena was sooooooo bad.”

I took up his challenge to find out how much he helped the team

Analysis: On June 6^th Mike became the regular starter and here is the Royals record before and after that point.

	Actual Record	Percent	RS	RA	Percent	Projection PythagreonRecord for the season using RS and RA
Until Jun 6th (60 games)	23-37	0.383	218	281	0.376	61-100
After June 6th (102 games)	52-50	0.510	473	500	0.472	77-85

It definitely looked like a different team comparing them before and after that point. The turn around might not all have been because Aviles replacing Pena, but looks to definitely be part of the change.