[Exile on Spencer St]

Something odd. Can anyone explain?
At yesterday’s defeat to Wycombe, according to the BBC, Bolton made six substitutions.
I can find no reference as to why, other than a report on the Trotters’ web site that states that Bolton’s final substitute came on after a concussion to “the hosts”.
I can only presume that should have read “the visitors”.
So, my query is why, if you can make a sixth sub after a concussion, did Stanley not bring someone on after Tharme was stretchered off against Lincoln? Did we simply not have a sixth sub that day?