Seems very inflexible, and perhaps the opposite of the Dutch Total Football style of the past:
surely in that situation the appropriately available midfielder (or forward) needs to deal with the attacker - and in turn, a forward slips back to cover their position. We need to avoid our defender getting outnumbered, and while that's where the priority is, make others available to help out.
I've certainly seen other teams quickly find 2 or 3 players to cut off an attacking player of ours.
So tactics may need work but I suspect the team also needs to work a lot more on communication, familiarity with each other and their jobs.
Knowing what to expect and how to respond in different situations.
But then, luckily for Ross County, I am no Ross County Manager.