All true. But where i disagree is where you term it as a "selectorial error".
In the test matches where the Windies in the 80s took the risk of playing 5 batsman - Dujon @ 6 & 5 bowlers (with which pretty much almost ALL the test Harper played). These where some of the results:
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Antigua 1986. Won by 240 runs
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Manchester 1988
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Leeds 1988. Won by 10 wickets
Along with those wins in IND 83/84 along with pretty. How could it be error when the team won?. Its was just a tactical decision, they knew they could pick that team balance & it wouldn't affect them. Simple.
Same thing with AUS in WI 2003 when Bichel batted @ 7, no way would West Indies have beaten AUS then. Bichel being successful there shows how inept WI where. That is all, calling these thing selectorial errors is madness..