What I mean is : Recently we discovered a lot of baryonic matter in the form of a halo around Andromeda galaxy which we did not otherwise know exist, and so needed to deduce the existence of dark matter to account for the gravitational and rotational effects of the entire galaxy. So with this discovery, do we still need to postulate the existence of dark matter for the Andromeda? Is the halo mass enough to account for the galaxy's motion?
Not enough baryonic matter in the objects like halo etc so far observed and discovered due to more detailed and accurate telescopic work. How about those not yet observed? The argument here is that the missing mass may just be yet to be discovered mass, and not dark matter. Instead of postulating some strange matter, why not just say some matter not discovered and observed yet, such as this latest halo? Why not just look harder with the telescope and you may just find another halo somewhere that can account for the flat rotation curve?