In my opinion, results or performance in the past 1 or 2 years can still be treated as old stats, though it can be useful but some people prefer to use just a one year stats or the statistics of that current season. There was a topic created last week about using recency stats and I think someone made a comment in that thread stating that they only uses the most recent performance or changes in the team's previous 1 or 2 match to make prediction of the next match outcome. Simply means that different bettors have option they explore and it works for them.
It would be just that common sense that you would be needing up to make up some adjustments at the time that you've seen that the players or manager have changed in compared into a year ago. Those data on using it would be entirely useless because when it comes to performance or plays then it will be that different but still its not bad to consider on looking up since not all will be that totally replaced but rather having those kind of new drafts on which you would be needing up to make those adjustments basing up on that new player that been added up or into that manager on how he/she made out some game plans. It will be that just that up to you on how you would be seeing things accordingly as a sports bettor on which you do need up to adjust and apply your analysis.