This is what happens when tier lists are made via super tournament bros instead of by match ups.
Zero Suit Samus shouldn't go up that high, hell, she might not even need to be moved at all. Zero Suit Samus is one of those characters that has a random factor, where people just don't understand what makes her bad. Because of that, people who use her exceptionally will place very well if their opponent doesn't understand the character. Now I'm not trying to say that the character still sucks, because that would be silly. However I don't think we need to stop dropping characters and replacing them with her any time soon. We should probably continue to see how she does in high-level tournaments as people learn her (as I'm sure people like Tyrant will). If she does well even when people learn the match-up, then her boost would probably be necessary.
The comment about BBR only knowing about a-tier doesn't really matter though. A-Tier is the tier that is most important to know (s tier being obvious) and that those characters will appear most often in tournament. The BBR only knowing about them in detail is completely acceptable.
As for Ike, he will more than likely getting a boost, his tournament placings have been consistently getting better instead of fluctuating. However just like Zero Suit, I think some research and some time showing how well he continues to be will show his true placing (even then, he's low enough on the tier list that we would have to do some theory crafting against low tiers to see if he's truly better; or you know, people could get together and play matches.