Anyone with waiver exemption (or who has cleared waivers and can still be sent down due to that) can be sent down before the trade deadline to make them eligible for loan later in the year. Jokiharju and Dahlin will still have waiver exemption then, as will Asplund. They could all theoretically be sent down, although I doubt they do that with anyone other than Asplund (and in his case, he might be sent down before that point anyway). Pilut and Olofsson could each have their waiver exemption end before the end of the season, though (it's likely in Olofsson's case, depending on when he comes back). Even if a team has a ton of waiver exempt players, they can't send everyone down on deadline day, though. Teams can't loan themselves below the minimum NHL roster limit.