Right, but they need good players. Lawler had a .750 OPS last year and has a ton of team control. They aren't going to deal a somewhat promising young player for a pile of our castaways.
The kind of proposal you're talking about - Ober or Larnach - is more likely to net you someone like Pavin Smith than Lawler.
Think about it this way, prior to this year, if someone over at DBacksDaily had suggested Brooks Lee for Zac Gallen, how many straight minutes would you have laughed before eventually breathing enough to say "Oh, you were serious? No. Absolutely not" to the suggestion?