Questionable Trade

The last place team in our league just accepted a trade from the first place team in our league. The first place team is getting AJ Green and Jordan Howard, and giving up Zeke Elliot and Desean Jackson.

I’m of the opinion that this is not legitimate given he’s trying to dump Zeke knowing there’s a good chance he misses time this season. What are your thoughts?

Every year someone tries to pull a quick trade towards the end of season with a last place team. How do we avoid this? Keepers and ability to trade future draft picks?