This is just a variation on what others have said, but it's a complex issue, so I'll take my shot. I think when most of us say "untouchable," what we really mean is something like "highly unlikely, based on what we know about past trades, to bring sufficient value back." The trick in fleshing out that idea, of course, is assessing "value." More precisely, some kinds of players are hard to value. A top, young prospect with lots of growth potential, like Arcia, is very tough to price. Trading him even for another team's equivalent prospect would be a crap shoot of epic proportions. At that point risk aversion kicks in, and you don't trade the guy. "Value" also means different things when a team is at different levels of success. An older or expiring (contract) player who's great right now is worth more to a contender than to the Brewers. A three years-away prospect is worth more to us than a contender. We all know these things. The complication is that the prospect is always harder to value, because he's developing. Thus, the team trading the reliable vet for prospects wants to price the prospects based on a conservative estimate of their value. Only a contender plugging a big need will play that game. What all that means for the Brewers' 25-man roster is that our young, good, team-control guys are (a) valuable to us in their own right, and (b) relatively hard to price, along with our inherent posture of © wanting to trade for other teams' hard-to-price prospects. That makes those guys almost "untouchable" in the sense I'm understanding that term. I think that group likely includes: Peralta Nelson Jungmann Fiers (not young, but very good and cost-controlled) Knebel (I don't care much about bullpen guys, but he's raw and unproven with tons of potential) That category arguably also includes: Lucroy (serious uncertainty for me whether he could be an asset to the next good Brewers team) Davis (I think people underestimate the value of his power bat, and if he consolidates his plate-discipline gains, look out) Smith (if Toby's right that he could start effectively) Blazek (if he can start) Jeffress (slightly over-ripe version of Knebel) Again, I'm not saying "don't take calls on any of these guys." I'm saying the calls you get are highly probable not to be worth taking. Braun's in a weird category by himself. He's very good, and I think he's going to age well. He's about to get very expensive. But if this team is ready to contend in, say, three years, he could still be a very useful player even at his salary. Or not. Also, teams now still want a discount on him based on The PEDs, The Lie, and The Past Two Crappy Seasons. At this point I'd probably want more for him than anyone would pay.