The Ergo parternship with Cardano

It would be really nice if I can get an answer from an ambassador or an IOHK member. Now I am an investor and I see it like am investing in the community, and I very much like Cardano (got in in July 2020)

Now my question is: How could ERGO, proof of work, have a truly long lasting and strong partnership with Cardano, proof of stake? Is there something that ERGO could bring to Cardano that Cardano can’t do?

I hope somebody has the answer. Thank you very much!