Don't do it.

If you want to bring a scout in, do it on Sunday, then you will have a full season to get the benefits of his scout status.

At the moment, you will have 3 days before he falls down to 5 star - where he will just then blend into your team if you were able to get high 5 stars at the start of next season.

Get the scout on Sunday when the new season starts. That way you will get a whole seasons worth of benefit rather than a couple of days. To me getting a scout now would be a massive waste of tokens