For leaving Lee "blind" on the approach to Gettysburg; and while Stuart was good in other repects I don't believe that successor Joe Wheeler would have done the same to his C.O.
Mosby (who is on your bad list) came to Stuart after Brandy Station and told Stuart that he could inflict serious damage on the Army of the Potomac and confuse his plans by passing around Hooker's army and Washington and then rejoining Lee in Pennsylvania.
Stuart communicated to Lee this plan.
On June 23, Stuart received communication from Lee (signed off by Longstreet) that okayed the Stuart's plan. Stuart was to meet Early's advance at York...but to go quickly. Lee also said in this letter that Stuart's plan might be the quickest way for him to get to Pennsylvania since the roads from Shepardstown and Williamsburg were filled with infantry, artillery, and supply trains.
Lee went on to say that if Stuart chose to ride around the Union Army, then Early would look for him at York or communicate to Stuart where the army was concentrating.
The next day, Stuart executes the plan. He takes with him Rooney Lee's, Fitz Lee's and Hampton's brigades, leaving with Lee Robertson's and Jones' brigade, under command of Brigadier General B.H. Robertson.
To this force was added Jenkins' brigade, which constituted the advance of Ewell's corps in Pennsylvania, was fully equal in numbers to the brigades which accompanied Stuart. He left Lee more men than he took and Jones and Robertson were very capable commanders.
Stuart's appearance in and around Washington caused Hooker to delay Sedgwick's Sixth Corps (also the AOP's largest corp) from marching with the army as Sedgwick was left to keep an eye on Stuart.
On June 30, Stuart engages Kilpatrick at Hanover. From the newspapers, he learns that Early was heading toward York and has no reason to believe that Lee's plans to consolidate the army at York has been disrupted.
Early has turned around and is headed back to Gettysburg. He leaves no word for Stuart, though parts of his column pass not more than 7 miles from Stuart.
Because word was not left, Stuart looses two days pressing on to the Susquehanna when word reaches him to make haste to Gettysburg.
Now, the main problem with the "Stuart left Lee blind" argument is (1) that it must be proven that Stuart really did leave Lee blind. He did not. He left Lee ample cavalry. Lee chose not to use Robertson and Jones, leaving them to guard the Valley passes. He did call them up, but only after the enemy was engaged at Gettysburg, but they were available to him on June 23rd.
(2) Word reaches Stuart from Lee that the army is at Gettysburg. How did that happen? Because Lee knew where Stuart was... Knew he was at York because he (Lee) was the one who ordered him there.
There is an excellent book on the subject entitled The Sabre and the Scapegoat. It is well worth the read. I think you might be surprised what you find there from not only Stuart's staff, but from Mosby, Early, and finally Longstreet himself that supports the argument that Stuart followed his orders, and Lee's blindness was self-inflicted.
I am not pitting Lee versus Stuart. Both men have my deepest admiration and respect.