My understanding goes like this - let's say, by the cut-off date for the Dubai SSF, CHN have Tian Houwei, the higher ranked SS standing MS, and Lin Dan, the second highest SS Standing MS , in the top 8, whilst Chen long is ranked outside the 8, meaning CHN already have max two allowed in the top 8 qualifiers for the SSF, then the automatic Olympic champion or World Champion (non-OG year) qualifier will replace the lower ranked of the two CHN MS qualifiers, that is Lin Dan's place will be taken over by Chen Long. Of course, if Chen Long chooses not to go, then Lin Dan's place is retained for him.
And if Lin Dan also decides not to go, then his place will go to the 9th ranked SS Standing MS. At the same time,it's possible that Tian Houwei can choose not to go and give his place to Chen Long instead whilst Lin Dan remains a qualifier.
Clearly, the maximum two entries per MA rule for each discipline and the automatic qualification entitlement for the reigning OG/WC titlist take the top two precedence over everything else.
In the Tian Qing/Zhao Yunlei's case, they qualified as the reigning WD champion as CHN had one other WD pair ranked in the top 8 of the SS Standing, Luo Ying/Luo Yu as the top seed, thus pushing out the No.8 ranked WD pair whatever MA they were from.
As for the 9th ranked SS Standing player or pair in each category, they get to go if the 8th ranked player or pair opted out of it but again subject to max two entries per MA.
Apparently, the Superseries Finals give the prerogative or special privilege to the reigning WC or OG titleholder so as not to diminish the stature by having the best 8 and including the World or Olympic Champion in the season finale. Don't forget the World Championships and the Olympic Games are ranked as BWF Tier 1 tournaments awarding 12,000 ranking points, higher than the BWF SS Finals and Premier events at 11,000 ranking points, for the respective winners. So, logically speaking, how can the World or Olympic champion not be featured in the SSF ?
http://www.bwfbadminton.org/page.aspx?id=15370
Btw, the automatic qualification for the reigning WC/OG titlist is not the same as wild card entry, technically speaking, because his/her/their place in the SSF cannot be given to anyone else other than the WC/OG titlist.