I think you've somehow misread it. The bit you've quoted says "eligible to play in 2017", which of course they are. I think they're allowed to start training with the club again next December.This AFL article says Keefe and JT can't play in 2017, this isn't correct is it?
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http://www.afl.com.au/news/2015-11-27/adcock-heads-rookie-drafts-secondchance-saloon