Theoretically, orcas and dolphins kind of match the power of whales on Hive. Practically, whales are fewer and unlike the former group, are in the habit of protecting their investment.
Being a large group, orcas and dolphins will never vote as a block. Tbh, neither do whales, most of the times. But for orcas and whales, it's practically impossible to make them have the same position on any matter, or any position at all. It takes a JS takeover event to awake the majority of the still-active relevant stakeholders to a governance matter, and even then, they will be divided, as history showed.
But I agree, orcas and dolphins should be more active in using their influence on Hive. Preferable by themselves, rather than delegating it away.
They don't need to have the same position on any matter. It would be nice if a group of orcas and dolphins could bundle their powers to support certain projects.