Ok neither are close, I can't see them leaving a post like that.
Honestly speaking, I don't think "being close" matters at all here really.
The fact of the matter is that it seems as though it is "acceptable" for Control to
not be in the Control Tower. That said, they are relying on radio communication, which, although not as thorough as having a full control console in front of you, can be moderately effective when monitored and executed well.
Air Traffic controllers have limited console-based informationa and rely significantly on accurate radio communication.
The problem comes in when you have someone who is relying on radio communication who is
not dedicating their attention to what is being communicated.
Honestly speaking, if Control does not
need to be in the Tower, it would be conceivable that they could be in a different country and still accomplish the job. However, I wouldn't appreciate them ordering their sunny-side up eggs while waiting to hear back about the switch position confirmation.
In the end, as board said, it may not be a big influence
what the on-duty, Control, or whoever was doing in this case, but in general, it would be nice to think that the #1 who is coordinating movement of heavy machinery with people inside would be paying close attention to the radio!