The word "dynamic" suggests the actively holding sway of forces, and as such cannot prevent to be called a special form of vitalism. [A system-only, a dynamical system, only transforms its states, such that lowest-energy states result. All true development of such a system must be attributed to some vitalistic directional factor.]. If, however, one denies this [vitalism] in all conclusions and extensions, then one would arrive at a very plain mechanism, which only may be able to give the mystery of the unexplainable a certain esteem and stability.
Also the higher organism is not a truly dynamically structured form -- only some, and at some times appearing, features may be adequately described in this way -- but a functional form. This expression is basically better, because it is not at all tied up with activity or passivity, and therefore remaining flexible in its meaning.