Team Impulse and Fnatic

So, to my understanding, teams in each region need to have three players from that region (including those grandfathered in before the rule was made) and three players from the previous split's roster. So then, with these assumptions in mind, how exactly have both Team Impulse and Fnatic qualified for the 2015 LCS Spring season? Both do meet the requirement of having 3 players from their home region, but both teams also only have one player from the previous split. I would really appreciated elucidation on this matter as it seems somewhat unfair to the teams who were competing to get in through the expansion tournament.