a) Saschana can be trusted. We return to the army and travel to the wooded grassland together. If need be, we can observe from there. The army will be needed for protection, in any case.
b) Though you feel it unnecessary, it probably would not hurt to be cautious. Let the Lord Seeker go and observe for you. If he is captured by the steward while skulking, it will not be a devastating blow to the leadership in this quest.
c) It is a good idea. Martel can return to the army and lead it, laying siege if necessary. The rest of you should go immediately to the grassland to observe. Martel knows the goal and is capable of carrying on the quest should you be captured.
What do you decide, Sky Road Walker? Vote! Share! Good luck!