Oh, ow. Taichi felt that, and he's going to feel like an asshole. Putting that all on himself when Ken was feeling this way for god knows how long? Enough about his own problems, he needs to make this better for Ken, asap.

"... If it makes you feel better, none of us actually beat Alphamon," he said. "Even Omegamon was only enough to drive him off, and who knows what would have happened if we fought to the bitter end."

There'd been so much destruction from their battles. Taichi didn't like the idea of what'd happen if one of them had actually been brought to a conclusion.