Calling Poirier a rookie and Wanamaker a 2nd year player seems a little disingenuous. If Danny thought we were signing pure 'rookies' in those two, he wouldn't have done it. They are expected to perform from the very beginning - albeit, probably at a lower-end vet rotational level. Theis should be included in this conversation as well, but not too many people are harping on him since he is now in his 3rd year.
Guys like Grant and Edwards also aren't your prototypical rookies. They may not have major roles early on (or ever), but one can see that their skills are easily translatable to the NBA game - at least in some way.
So sure, Langford and TL might not be ready for prime time, but that's about it...and they are worth taking the time to work with. Strus, Waters, and Green (26 y/o btw, no way he makes the roster, right?) shouldn't be discussed - they are just two-way players - every team has rookies in those positions. I imagine people will stop freaking out when we finally pick up a vet for that 15th roster spot. That might not be until after the deadline, though.
High level NCAA basketball is better
basketball quality and basketball competition than most pro leagues around the world. Most pro leagues outside the US play schedules only as long as the NCAA season. If I am not counting high level NCAA basketball as NBA competition, then neither is pro basketball from most other league around the world.
If I am calling college players like Edwards, Langford and Grant Williams, who played high level, top 20 NCAA basketball in the Big Ten and the ACC, rookies, then I am calling people who played in pro leagues outside the NBA rookies and 2nd players too.
I mean, some of the leagues that Theis, Poirier and Wanamaker played in early in their pro careers aren't even G League level competition. We certainly don't consider G Leaguers as having NBA equivalent experience. For example, Theis was DPOY in a league in Europe just before getting here. Yet his NBA defense is quite mediocre to just plain not good at times. Tre Waters was a DPOY in the SEC. My guess is his NBA defense would be quite mediocre to just plain not good most of the time.
Sorry, I just do not count pro basketball experience outside the NBA as being any type of equal to NBA play. Pro basketball outside the NBA compares way more favorably to NCAA experience than NBA experience.
And, I just don't believe playing high level NCAA basketball or pro basketball outside the NBA makes you ready to contribute right away once in the NBA.