Change facts? There's a better argument for Eriksson being a #3 winger then there is for him being a #2 winger right now. Prodcution wise he's been on the cusp of being a viable top 6 player the last two years. 40-50 points is serviceable, not ideal. He'' struggle even more in Boston due to a reduced role and ice time. Seguin is a 30+ goal, 80+ point winger at 22, still a boy among men.
Eriksson++ is great value for Seguin if you're the ones getting Seguin. The only way this trade doesn't look like a complete ass ****** is if Boston has enough solid places in place to again win a cup.