Return since inception is a meaningless metric of comparison. The fund could have started in 1929 or 1983 (or whatever) and end up having two different numbers because it went through two entirely different waves of economic returns (which can vary not only due to time but sector allocation as well). The only thing they have in common is that you can buy them today. This is not a mathematically correct methodology to use for projection. (In fact, I would not even bother projecting like this in the first place. Past performance, future results, etc.)
I also fundamentally struggle why looking at the track record of money managers and mutual fund tickers is acceptable and doing the same with stocks are not. Are the investment managers smarter than the people actually running the businesses? Buying a stock is bad because you focus your results on one business? Well, I feel buying a managed fund is bad because I focus my results on one money manager.
Look at FMAGX. When Lynch was running things, everything was great. Since then, not so much. They famously went too conservative too soon in the 90s and got hammered. In your account, it's just a ticker. Is the guy running things now as good or better (or ideally, the same person) as the guys responsible for prior performance? Yes, if you invested in 1976 and stayed, you'd have 4X more money. But they've underperformed substantially for decades. How can you tell the difference?
The other reason I index is to understand how I'm invested. VTSAX is the US market. I didn't know what CIBCX was, but I assumed it was bond heavy and not fair to compare to VTSAX. (It's more of a blend of international and bond, but it's still terrible for what it is. Vanguard and others also have blended funds if you want that as well.) This portfolio just looks confusing to me and I'd want to make it something I understand while it is $100K before it becomes $1M and harder to fix.
Selecting funds is simple, right?
In the end though, I'm just some random internet guy. You own your portfolio and its future results. But if you're confused and why you ask here in the first place, that's a real problem. That confusion compounds into fear when the markets are doing poorly. It's easy to blow it off when things are great.