Look, while I agree that some variation of "I love you" would be the angstiest thing for Satoru to say to Suguru right before death, I must point out two things:
1) Sorcerers consider love a form of curse (that's a major plot point earlier in the movie, in fact).
2) Satoru is the kind of bitch who would either say something neutral like "welcome home/Merry Christmas" or something petty like "Digimon is better than Pokémon."












