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Before anyone starts rioting because this may not be the best option for Seattle, let's look at all of the factors here.
In order to acquire a player like Giancarlo Stanton, the M's would have to all but empty their farm system. Sure, Seattle may be able to hold on to one of the big three. They may be able to hold on to either Brad Miller or Nick Franklin. But farm system players wouldn't be enough to get the deal done.
Miami is going to want proven MLB talent to fill their roster. This means someone like Kyle Seager would most likely have to be included in any deal.
GM Z could try and pitch the idea of including Dustin Ackley instead of Seager, but with Ackley's season last year, his value is simply not what it was before.
The problem with a trade involving Seager is that it leaves the Mariners with no depth at third in the entire organization. Baseball America doesn't list one third basemen in the top 10 Mariner prospects and MLB.com only lists Vinny Catricala in the top 10, and he batted just .229 in Tacoma last season.
Now in no way shape or form will the Mariners decline a trade for Giancarlo Stanton just because of Kyle Seager and the hole at third base, but it is something the organization has most likely thought about before.
Don't get me wrong, Giancarlo Stanton would make any team he joins better. His bat would be a fixture in the middle of the Mariners lineup for years, and Seattle would finally have the power hitting face-of-the-franchise it has been missing since the days of Ken Griffey Jr. and Alex Rodriguez. But the amount of talent it would take to get him is why he's not the best option for Seattle.