Credence only needs to be on a couple of exchanges. Why is it necessary to go on the big ones? Whatever exchange they go on, people will go to those exchanges to trade them. I think 1 or 2 is probably best because if you are on too many exchanges, the prices can fluctuate too much and volume might be too low on those exchanges. If you like to buy and sell quick, the fewer the exchanges the better. It would be nice to go on Kucoin or COSS exchange but that is a different story.
I agree with the first part of your post, being on a huge exchange would probably not change anything.
If you look at the Mercatox site now there is only 50 thousand or so total CRDNC available for sale to the public anywhere in the World and to me that is a good thing. It means they are scarce.
Personally I don't really like the Mercatox exchange but if they stay on there until they launch on coinexchange who gives a hoot? More important for me is if they have a working site and it does not lock up or go off-line for 6 days maintenance I would be angry if that happens. 50 thousand total for sale means they value of them will only go up I think.
Yes, supply is low and crdnc is scarce but price is not reflecting it because it is still under the radar type of coin. GRX with 17.5 Million in circulation is trading for 3.5-4 on etherdelta and it will go much higher when it hits bigger exchanges.
If you consider supply alone, grx has 5x more coins than CRDNC, if all else was equal Cr should be trading about 5x price of grx. Credence still has some catching on to do in marketing department, idea is to create demand for this coin. What im saying super low supply is not enough unless high subscriber youtubers are talking about. What drives the price is hype.