You keep using Iphikratean... That's a term I used for a while, but the word 'reformed hoplite' is probably a better one. The thureos was clearly used by the heavy phalanx infantry. Several Rhodian and Hallicarnasian (Dionysos, for one) historians of the period clearly state this. It also appears on Athenian and Rhodian pottery. The shield was lighter, but larger and more protective. The lengthening of the spears was a natural result of fighting macedonians. Remember, the traditional hoplite spear was about 9' long. The spears were lengthened to about 12-13' in the period. This makes the underhand stab the preferred control method, but it's certainly not unwieldy enough to merit 2 hands, like a 18-20' long pike.

The Thureos is a large sheild as well, actually longer and just as wide as the hoplon. The difference is between the plywood and metal construction versus solid bronze. The ubiquitous attic style helmet (or Thracian) is used regularly in this period.

We're not talking about a 'revolutionary reform', merely a 'refinement reform'.