Royals Trade Greinke to Brewers?

OK, I'm reporting on an off-season rumor again... but this one seems to have some clout behind it; I found the original article on ESPN, Big League Stew has talked about it, and Jim Breen @BerniesCrew tweeted this, this morning:

"Source tells me #Brewers have traded SS Alcides Escobar, CF Lorenzo Cain, and RHP Jeremy Jeffress for RHP Zack Greinke, SS Betancourt + $2M."

Here's what I think:

• Good for the Brewers, if it's true. This would give them a rotation of Grienke, Shaun Marcum, Yovani Gallardo, and Randy Wolf. That's the NL Central's version of NASTY. Watch out for both Greinke and Marcum moving to the National League.
• Not sure the Brewers would have any position player prospects left in the entire system. I think they'd be officially tapped out.
• Did the Royals get enough in this deal? Lorenzo Cain is a decent prospect who had a good 1/4 season in the majors, but he's also the same guy who hit .218/.294/.330 in the minors in 2009. Alcides Escobar was hyped pretty hard before last year, and has a ton of speed and potential, but also hit .235/.288/.326.
• The prospect jem in this trade for the Royals has to be RHP Jeremy Jeffres, a 2006 first-round draft pick who was converted into a reliever last year in the minors, and showed the potential to dominate. He came up late in the year and did the same at the big league level.