it can work
I rooted my Sm-900t using towelroot but you have to downgrade your kernel or bootloder I believe from NK2 (or whichever one fixed the vulnerability that made towelroot work) to NH5 or to a version earlier than august or july 2014 update using ODIN. There was a zip file with all of the components you need to downgrade, root, then upgrade back to the latest build. Search sm-g900t towelroot workaroud or something. This is for kitkat I dont know if jt would work on lollipop. Actually now that I think of it cf-autoroot-klte through Odin rooted my t mobile s 5 no problem. It did trip knox tho while the towelroot method above did not. I will look on my desktop to see if I still have the zip file and get back to you. if not I'm sure it's still on this website somewhere. good luck.