As we know, Maxwell came up with his equations long before the advent of quantum mechanics. So Maxwell's equations were not intended to describe photons. It is in that sense by itself a purely classical theory. It would fail to describe scenarios that represent a truly quantum aspect of nature. However, now that we know about photons, it is not uncommon to find an overlap between Maxwell's equation and quantum physics. So what is the relationship?
The role of quantum mechanics is often somewhat over stated, in that one can use a quantum mechanical description for situations that is perfectly well described by classical physics. Or, stated differently, the mathematical formulations that we would use to describe quantum mechanics can sometimes also be used to describe classical scenarios. (This begs the question, when is something intrinsically quantum? However, I'm not addressing this question here.)
So when we use Maxwell's equations, as opposed to quantum electrodynamics, to describe a situation that we would otherwise have considered to be a quantum mechanical scenario, then one may conclusion that such a scenario do not really represent the quantum aspects of nature. So what scenarios are like that? (Finally I come to the question):
There are two such scenarios that I can think of. The one is that of a single photon. But one needs to be careful. It is not the photon itself that is being described, but rather the wave function; in other words, the probability amplitude to find the photon at a particular point (or in a particular state, to be more general). So, if $|\psi\rangle$ is a single photon state, then one can expand it as
$$ |\psi\rangle = \int |\mathbf{k}\rangle \psi(\mathbf{k}) d^3k , $$
where $\psi(\mathbf{k})$ is the Fourier domain wave function. In the classical sense the latter is interpreted as the angular spectrum, and can be used as such in calculations. However, more generally, one can also expand it as
$$ |\psi\rangle = \sum_m |m\rangle \psi_m , $$
where $|m\rangle$ some discrete yet complete basis (such as the Laguerre-Gauss modes).
One also needs to be careful to exclude all interactions in this scenario, because interactions can introduce quantum phenomena for which Maxwell's equations are inadequate to deal with. In this sense Maxwell's equations describe the evolution of the wave function, of which a photon is considered to be a single excitation.
Having described it like this, we can allow more excitations, provided that we impose certain restrictions. The photons all need to be in the same state, which is in turn allowed by their bosonic nature. This restriction, however, makes it unfavourable to consider multiple photons. The reason is that superpositions of multiple photons can introduce the notion of non-local entanglement, which is a truly quantum aspect of nature and therefore cannot be represented in Maxwell's equations. This also reveals why interactions are to be excluded: they can (and generally do) lead to situations where one can find quantum entanglement.
Now for the other scenario. This one corresponds to the case where one wants to consider an infinite number of photons. It turns out that there is a type of quantum state that is called a coherent state which is considered to be the closest thing to a classical state. This state is a superposition of all the different number states (Fock states) all the way from a single photon state to a state that have an infinite number of photons (however, the latter comes with a coefficient that is practically zero). All the photons in a coherent state have the same properties in terms of their other degrees of freedom, thus avoiding the issue with quantum entanglement.
So, to summarize, I'd say that both Sakurai and Globe are correct. They just considered different scenarios.
