Left for T4 crafter Thralls.
They’re much faster to obtain doing a surge.
I’ve been around the camps many times and haven’t seen a single T4 yet.
But you’re right about fighters because…
I captured a named Fighter who has base stats of 7.4K health, a melee multiplier of 1.768 (higher than the lauded Aesir warriors @ 1.56) 15 Strength and 30 Vitality. Having fun with this one…
The Accursed Beserker will have the same stats as the cimmie, coming with 4437 health and an impressive 2.24 melee modifier.
Edit: however a lower strength damage bonus…