Still confused and I could just be being dense.

OK so the way it works is like this.

1 is the outer entrance there is a stone door

2 is a entrance with a continual flame that needs to be used to light both of the braziers on either side of the door. If only the left one is lit 3b opens, right one opens 3a

3 is the main area with three lion fountains the jewels in the coffins in area 3a and 3b are inserted into the northern lion head and then the wall opens to 3c

3c contains four additional jewels on the altar the sword is on, these are used in the corresponding fountain to open the wall to area 4

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Are you suggesting getting rid of the main entrance south of area 2?