1) First of all focus on which direction you are going to enter the middle from. You need a direction that prevents you from immediately getting killed by seep, there's only one option here.
2)
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×Now you've cleared all of the NW and SW seep you have only two groups left to manage. The gentryii is only blocking the path to the SE group, but if you step around the gentryii towards the NE group you get ambushed by two seep. But one of these squares seep ambush you from is not like the other...
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×It's a door...
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×You can't open the door, but it was open earlier, so what if you left something on the door to block a seep from stepping on the closed door?
3)
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×Only the SE seep remain. This time we really do need the gentryii to stay out of the way to even get close to the group. The position of the red doors that opened up on the SE and SW groups hint at a path, if only we can stop the gentryii from moving South. However if we put a wubba directly south of the gentryii then when the red doors toggle he will move out of the way and block our path.
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×But what if we didn't put the wubba there at the start and positioned it later?
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×You need to put the wubba in the South passageway, but not too far North. Then you can move it into position when dealing with the NE seep.