The map pool can grow and shrink over time, even if a core sticks around since forever. With the Stewie2K/tarik lineup, they had a decent map pool, but they weren't gods on any of them like Astralis with Nuke and Inferno or G2/HR on D2. You also have to consider that they just put the team back together over the player break, meaning they weren't going to establish a good, deep map pool during that time. From what I've seen so far from the Legends stage, the only maps they got going is Train, which they beat NiP convincingly and a map in which NiP is pretty good on, and Mirage, which they beat compLexity somewhat convincingly, though I wouldn't say compLexity is really good team on Mirage. The only other map they played in the Legends stage was Inferno, and although they did win twice on it, they won it against NiP and G2, who weren't good Inferno teams in the first place, and it was competitive with 16-14 and 16-12 scorelines respectively. The other Inferno game was against C9 and they got blown out 16-3, though C9 is a decent team on Inferno. They need at least one or two more maps to be competitive against the top teams and the sample size is too small right now, so we can't dictate where they'll go (except Nuke). Against the Renegades, it's looking a little bleak for MiBR in terms of the map pool because they can play five of the seven maps in the pool (six if you really want to consider D2 since they blew out Vitality on it 16-5). MiBR is at a disadvantage with the map vetoes. The only saving grace right now is their firepower, as they have no team cohesion.