I would have no issues with this, but ultimately it is up to the individual investor and their particular tolerance for risk. If I did not believe Brookfield Renewables to be undervalued, I would have likely sold that portion of my portfolio and allocated it to Brookfield Corporation. This would result in Brookfield Corp being around 5% of my portfolio, which is typically the allocation I assign to core holdings.
But again, that is my strategy, and it is one I've typically stuck to over my investing career. I tend to trim holdings when they get above this. However, I know plenty of investors who allocate much heavier than I. I know some people with multi 6 figure portfolios that have 30%+ in an individual company. Not my cup of tea, but it certainly is theirs.
If you're asking if Brookfield Corporation is a high enough quality of company to justify that allocation, I would say yes. Does it fit within your overall tolerance for risk having a single equity make up a double digit portion of your portfolio? That is for you to decide.