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Hi Greg,
The evolutionary path that any star will likely follow is determined by the mass that the star achieved when it formed. Whether the star had high or low metalicity is really a reflection more on when and where it formed.
High mass stars live fast, die young while low mass stars chill out, do nothing in a hurry and live long lives.
No doubt the density of the material available for star birth at the time the globs formed is a major reason for the size and density of these clusters.
The number of stellar fossils found in globs bears witness to the age of these clusters. Black holes, Pulsars or Neutron stars being the fossils from the high mass stars and White dwarfs being the upper end of the low mass star fossils. The truly low mass stars still happily on the main sequence as the Universe is not yet old enough for them to have moved off of it.
Regards
Trevor
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