Not possible. Tira and minions still loyal to the sword spent years working had to collect as many shards as possible to reform Soul Edge and only then, was Nightmare reborned because the sword had finally regained quite abit of its powers.
Other people could have been tainted or possessed by mere shards and become malfested like Pyrrha, but never Nightmare until they hold the sword. And Dumas was the first one to wield it when the sword was it was reformed. And where did you hear Soul Edge took control of a swordsman in the forest? (>O_O) I never heard anything about that. To date, SE was wielded by Algol, Cervantes, Siegfried, Graf Dumas/Raph and Pyrrha.
Sources: Official SC website and this
http://soultw.blogspot.com/2012/02/history5.html ---> Entire timeline of SC history in chinese. Used google translate so i sorta got the gist of it lol. What's more important is the info on the official SC website, which can also be found on 8way wiki.