After the original schedule fell apart, it basically all came down to one key moment as to whether to try to salvage the plan, ...or, just give up on the plan and blunder forward. That key moment was the meeting between Rosecrans and Dickey and Lagow. After that meeting, their guide was sent back to Grant with a dispatch from Rosecrans.
Rosecrans could have decided to try to salvage the plan, and inform Grant that he could not be in position before dark on both roads. He could have told Grant that he would continue with plan to block both roads and Ord should attack at dawn the next morning.
Or, Rosecrans could send Grant a gibberish message that didn't make any sense, and just blunder ahead into a late afternoon battle.
Rosecrans chose the blundering option. It really doesn't matter how much spin is applied to this battle. The plan failed because Rosecrans fell behind the schedule, and then brought on a battle with the Fulton Road left unblocked.