Hmmmm......just called Amex and they told me I would not be eligible for the 50,000 "welcome" bonus if i've ever had a platnium card if i signed up for the MB card.
That said, I guess the MB card is out.
So now its, do i cancel the card and get a new platnium card. No welcome bonus but do i get a $200 airline credit for 2015 and 2016?? Or just 2016? It's only $100 but might be worth it as i'd also go ahead and use the card to get my wife TSA pre-check.