Large Cool-Cores vs. Coronae

Recently it was shown that most clusters have entropy cores (http://arxiv.org/abs/0902.1802) at scales of few 10s of kpc, and if the core entropy is < 30 keV it is very likely to show cool filaments or radio AGN. However, this paper (http://arxiv.org/abs/0904.2006) suggested that the core entropy is not a well-defined quantity in all cases because some clusters show high density, low temperature coronae associated with the central BCG at much smaller scales (< 5 kpc). The paper shows that strong radio emission is seen in all systems with cool gas, either in form of traditional large cool cores or small coronae. Thus, non-cool-core systems which show radio are very likely to be unresolved coronae systems. Now the question arises whether the coronae show cool filaments as the systems with large cool cores do?