I've lost track of how many times I've watched a replay where someone asked for a con on my own team and I didn't even realize it happened until I was watching the replay, after the game was long over.
It's very easy to lose track of chat and miss chat messages. A player not having a constructor is a dead end state and should automatically notify their teammates that this happened, so they can react accordingly. Preferably with a big shiny notification in some corner of the screen until the situation is resolved and the player has a constructor.