Everyone's welcome to join in, even the deluded Saul Nay-Sayers. They don't get Saul Snacks though. Which, in their delusion, they would believe to be poisoned or summat.
Saul was agitated during the polygraph, hence the odd results. He rushed off as there were more urgent scary matters to deal with. He's a seasoned agent so would have been able to fake the test even better than Brodie.
It was an act of kindness to give Eileen his spare glasses that she killed herself with.
And the burial at sea, someone senior had to be there. And if he hadn't, he'd have been killed and we wouldn't keep having these discussions 
Dar Salieri is black of heart though.
Can't stand Hair (and haven't quite forgiven Saul for yuck, that) and hope it doesn't turn out to be a tragic story of blackmail, a terminally ill family member or some such guff.