@Anthony *******
yes but before you apply for Coe, you applied for visa. Those are two different processes. TR have nothing to do with Sandbox or quarantine in Bangkok because you can also get visa and use it in 3 months time like before. You just putting all paperwork as one big process together. And sure, you need all documents eventually.
But if he starts with what he needs and add other things later it could save himself money if there is a delay or cancellation each one of the steps..
It’s 3x more expensive to come to Thailand now than before covid. (Been coming for last 5 years on different kinds of visas) So it is worth to be cautious, read every line two or three times before applying. Specially now when things are changing by day..