He's pleading the character to battle with him- and he's just the nicest guy working with the not-nicest people. Plus, as it turns out, Solaris notes his incompetence rather than his disloyalty; it would be easier to get away with being too weak than disloyal. Disloyalty is a sign of weakness anyway, so if Taka is punished for his weakness, in theory, it should be less severe than for disloyalty. Look at the grunts: they're all relatively weak, but they don't seem to be replaced an overwhelming amount. Many new names come up during each encounter, but old names have remained. For Solaris to take note of Taka's failure, that may signal the final straw, though. Pleaaaase don't kill Taka. He's got a cool scarf.