He is speaking of the forts which are only needed to force tariff collection."
Well, now, grammatically, it doesn't say that at all. On first reading, that appears to mean two different things ...
“The power confided to me will be used to hold, occupy, and possess the property and places belonging to the Government."
AND
“The power confided to me will be used ... to collect the duties and imposts."
If it is assumed that he was referring to only that he would use the power to "hold, occupy" and possess" the property and places belonging to the government that (or which) collected the duties and imposts, he would probably have said it in that manner.
As stated it is clearly a compound use of the two powers that he believed had been confided to him.
You are hiding behind grammar, loose logic, and assumptions rather than placing his actions in context.
Too much mental gymnastics. See the records of his actions, not what you think could mean this or that.