From your conversation i got my answer why escrow.ms and one more user is not leaving trust for the trade done b/w us because it will add me into default trust which is not fine for now.
No it wont. You can leave a user trust and you can add a user to your own trust list, they are two different things. If you add someone to your trust list and you are in DefaultTrust level 1 then that person will get added to defaulttrust level 2. Only theymos can add people to defaulttrust level 1.
All feedback left by people in defaulttrust level 1 and 2 will show up as trusted feedback.If we suppose that all the users have 2 as minimal trust depth, but there are some users with 1 as trust depth. For the question regarding the 'Only theymos can add people to defaulttrust level 1' do you know that
DefaultTrust is an user
https://bitcointalk.org/index.php?action=profile;u=122551 managed (obviously) by theymos.