@perennialloner,
Loner, the meaning slightly diff, "secondary" implying the quality of some action or habit which both have undergone whereas "second" is noncommittal in that respect
At the finish line mom was second
In terms of their ability to control temper, secondary
As far as "correct" is concerned, help Neo, Set, Man, Oss, Rog
Edited to beg forgiveness; it s/b "Setanta"