I agree with everything but this one part.Naruto knows that Sasuke is underestimating Loneliness.
Sasuke seem to think that going through loneliness is something easy because "Naruto could do it"
Out of both sasuke and naruto, sasuke has stepped farther into the realm of loneliness than naruto. Naruto knows that sasuke can live in the realm of darkness and solitude, but he doesn't want sasuke to sacrifice himself since they both know how that world is. Naruto doesn't want sasuke to sink all the way into darkness with no chance of ever seeing the light again.