Rangers fan here, we've made some bad trades in the past, but there's no way they make that kind of trade. 1. Davis has big time power to all parts of the field and his raw power is comparable to that of Josh Hamilton; saying he's got 30 HR power is selling him short. The thing that will most define his MLB career is his pitch selection. As it is, he's already pretty good. 2. The Rangers are very likely to pick up Blalock's option and let him play DH/1B. $6.25 million is a small risk for someone with Blalock's talent, there's no reason to trade him, just to trade him. The upside to picking up is option is fairly high, If he can stay healthy and put up big numbers, he will have more value than just a throw in player. If not, it doesn't really matter, as he's only making $6.25 million. 3. Why would the Rangers want Bill Hall? 4. With Justin Smoak down in the farm system, who should be ready by 2010, why would the Rangers trade all that for another 1B? Why trade for a 1B that may not even be a substantial upgrade over one of the players they're trading to get him in the first place? 5. If that group of players end up getting traded in a package like you presented, it won't be for a 1B, it will be for starting pitching.
They may have a poor pitching staff in '09, but that farm system is loaded with quality pitching prospects. I'd go as far to say that the Rangers have the best collection of pitching prospects in the game.