"No," Daniel answers unhappily. "Theoretically I should be able to physically manifest but I - can't, for some reason. Right now I'm choosing to blame the Rift."

Just another reason he can keep going and directing all his frustrations at the thing. It's probably - it's been a while, hasn't it? For a relative meaning of the term 'awhile'? That's not even really the Rift making it difficult anymore, it's just him. He's not built for linearity anymore.