And don't forget Jeigan often come with a result of much lower stat growth potential unlike Seth whom I should never count him as a Jeigan.
The reason why Seth should not be considered a Jeigan is that he's got higher total growth rates than every other potential paladin throughout the GBA FE's series, with just 25%. He's got respectable starting stats for a level 1 Paladin. They're higher than FE7 Marcus', which was already significantly higher than most Jeigans especially FE6's Marcus and Zealot. Seth doens't often get RNG-screwed as all the other cavaliers in the FE's GBA. This is considered to be one of the most useful pre-promotes there is for experienced players such as me. He starts off with both A Sword and Lance weapon ranks. Despite the fact he starts out as a pre-promote, he saves the opportunity from you using a Knight's Crest and hundreds of exp if you use him instead of another cavalier. He is excellent support options such as Eirika, Cormag, and Natasha and any other certain characters that are able to support with him. And that his Anima affinity is acutally a good affinity better than Kyle's Ice affinity and Amelia's Thunder affinity IMHO. Also Seth's stat average total at Lv. 20/20 Paladin is actually much higher than even that of Sain from FE7 at Lv. 20/20 Paladin. Which is acutally true. It's true that most Jeigans aren't great. But Seth is just different than any Jeigan's. His level up stat growths rates are phenominal. Believe it or not, they were actually higher than every other potential paladin's. Even though Seth gets fewer levels to enjoy his better stat growths, he's also RNG-screwed proof, unlike Amelia and the other cavaliers. Thats why I don't consider Seth a Jeigan.
HP |Strength|Skill |Speed|Luck |Defense|Resistance
Seth: 85% 50% 45% 45% 40% 30% 25%
Total: 320%
Kyle: 85% 50% 40% 40% 20% 25% 20%
Total: 280%
Forde: 80% 40% 50% 45% 35% 20% 25%
Total: 295%
Franz: 80% 40% 40% 50% 40% 25% 20%
Total: 295%
Amelia: 70% 40% 40% 40% 50% 30% 15%
Total: 285%