Is this a good Keeper trade?

No-Saunders is not a proven pitcher just yet.You already have great releif pitching so you really dont need papelbon.Since it is a keeper league I especially wouldnt do it.Next year you will have Joba(who will be dominant)Harden with a sure fire contender and I dont need to go on.The way you sit you will dominate the pitching category for years to come.Proven pitchers are hard to come by every year.Theres always a few that come out of the woodwork each year but the staff you already have is proven themselves.