I have to agree with you. I think the offer is a good start, but I'd bet the Red Sox would have to give up at least two more prospects and it still might not be enough. The Marlins have Marisnick, Ozuna, and Yelich, so Bradley Jr. may not be as valuable to the Marlins as he is to the Red Sox. Owens and Ranaudo are projected second or third starters, and like you said Cecchini has plus-plus contact projection, but not a lot of power, which has to diminish his value a little. Furthermore, one of the bigger holes on the Marlins is SS. Bogaerts would immediately start for them there.
Someone earlier in the thread said that he thought that 2012 was an aberration for Stanton, and that 2010, 2011, and 2013 might be his normal seasons. 2010, 2011, and 2013 were/are his age 20, 21, and 23 seasons. He's a beast. Bogaerts has to be in the deal, unless the Cardinals, Rangers, and Red Sox all conspire to refuse the Marlins their top prospect.