These are legitimate disputes among professional military men, all of whom know we are going to win the war and do so lopsidedly. The press, defeatists, and peaceniks glom onto those discussions and try to blow them out of proportion. And some noticing that think there is no real discussion or reason for the criticism. Both are wrong.
There was method A and method B of getting the job done, and B was riskier but might have been feasible with half the ground force. They tried B with A as the fall back plan. Some said all along they'd need A, and they were probably right (we will know mroe clearly in 3-7 more days). It was and is a legitimate professional military dispute, and not political carping or alarmism or defeatism. The only thing at stake in it is how fast and how clean the win will be. But worrying about that is their job.
The Turkish problem is what made it a serious issue. (The early 101 blow up also did not help). If the 4th Mech were already in country, things would already be a lot farther along. As it is they will be there reasonably quickly, and 2 more heavy divisions are on stand by, if needed. I think it would be prudent to plan on sending them and get that geared up. Better safe than sorry, at this point.