i think any Mahayana tradition stands to learn a great deal from the Path of the Elders, that's why i'm here. i'll confess i don't know a great deal about Zen...other than having read Suzuki's The Zen Doctrine of No Mind when i was much younger (probably too young to pick up on a great deal of it if i'm being honest) but from the little i do know of it i can understand why often there might be a lot of...erm..interfaith dialogue (is that an appropriate phrase to use?) between the two. especially the Thai Forest tradition. the reason i became interested in the Path of the Elders is in the hope and belief that it will enrichen and strengthen not only my understanding of the path i practice but also my understanding of Dhamma full stop.
incidentally Ben, if you are struck by the poetic expression of Zen, i would highly recommend The Narrow Road to the Deep North by Bassho!
Monks, even if bandits were to carve you up savagely, limb by limb, with a two-handled saw, he among you who let his heart get angered even at that would not be doing my bidding.