Okay, but since spawning is enacted at the same time for both teams, shouldn't the choice of where each player is spawning be revealed simultaneously? The fact that we're choosing at all implies that knowing what the other team is doing would influence our decision-making for spawns, so even though subsequent moves can be revealed as they're settled upon (as the other team can't react until the moves would be executed regardless) we should keep this particular phase in spoiler tags until everyone is ready, right?You should spoil individual choices and the rationale behind them for your team's eyes only. All the opponents should see is the simultaneous move your team makes.
Essentially, consider the spoilers as the "thought process" of the team. In a standard chess game, it would be one person thinking all this. In riot chess, it is an entire group. The need for secrecy is still there, it just manifsts differently.
Also, do you want moves to be made as votes or just informally written out? Should they be collated into a single post?