i don't think your pitching looks weak for this year. Grienke/Latos/Peavy/Chapman is a fine pitching core IMO. I wouldn't give up a guy like Kinsler for a mid-range arm and a closer under pretty much any circumstances though. If you're hurting for saves just go prospecting for closers in waiting and you'll get some hits eventually. It's not that the value is bad for you of course, not if Medlen hits, but I still don't like it.
No if anything I would try to acquire one more stud OF. What is available for RP prospects? DO NOT TRADE KINSLER you don't have another option on your roster!
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The only maybe reliable closer on that list is Parnell. Who would be comfortable dropping for him? Personally, I'd drop Profar for him in heartbeat if you've already drafted.
For a 10 team league, yes, I think you are a bit weak at SP. But I would NOT trade Kinsler for a young SP and a closer who could lose his job witht the strength of the 2 set up guys in Wash. you can always find 5-10 closers throughout the year, you just have to get them. Wait and see what happens with Chapman. I am concerned that he will not make it in the rotation and may end up closing again.