Ok, I'm taking a shot at it with some detail to clarify. Feel shaky on some of the positioning but, there it is.
1 Hancock; For all the reason we all know. He was everywhere, every day, sending troops to all sectors even Day-1 posting Steven's battery on the knoll between Cemetery Hill and Culps Hill. Day-2 commanding the left personally guiding whoever he saw to the exact spot in some instances; Caldwell, Williard, 1st Minn. Day-3, still cool as a cucumber riding in front of the line during the cannon aid to calm the men.
2 Hunt; Like Meade and Hancock, even more so, he was everywhere, assuring his artillery was well placed, supplied, broken gear repaired and the reserve ready. He was seen up and down the length of the line. Confronted the belligerent Hancock on conserving long range ammunition Day-3 that proved invaluable with McGilvery's gun line and Rittenhouse atop Little Round Top devastating the right of Pickett's line, Osborn blasting the left of Pettigrew-Trimble while 2nd corps batteries (Hancock's) were silent, out of long range ammunition. At one point during the assault Hunt charged into the fray at The Angle unloading his pistol until his horse was hit, pinning him to the ground. He received a promotion to Brevet Col. Us Army fFor gallant and meritorious services at the battle of Gettysburg".
3 Howard; Having the presence of mind to leave an entire division on Cemetery Hill. Unfortunately, he was atop the Fahnestock building when command devolved to him, not with the corps to correct Barlow's placement too far forward at Blocher's knoll (Barlow) instead of closer to town at the Alms House buildings. Barlow's decision, not the fighting quality of the corps as evidenced by Gordon's 30% casualty rate led to the collapse of the corps line.
4 Sykes; Got his corps to the field intact (limited straggling) and later to the left in one piece to save the left flank at Little Round Top vs Law then vs Kershaw, Semmes, Anderson et al who later attacked the western slope of LRT. Tilton-Sweitzer, Burbank-Day helped delay Southern efforts earlier in The Wheatfield. Everything about LRT is the 5th corps. Needs to have a statue.
5 Sedgwick; epic forced march to the field giving Meade the numbers and confidence needed to secure the left and right (Neill to Slocum's support) Day-2. They loved their 'Uncle John' but he was all business that day, stabilizing much of the line with his 6th corps.
6 Pleasanton; Can't ignore the work done by Federal Cavalry early in the campaign and Pleasanton's promoting high energy men to lead brigades before the battle who displaying aggressive behaviour in major engagements at Upperville, Middleburg and Aldie and subsequent actions at Hanover, Brinkerhoff Ridge, Fairfield, East Cavalry Field, and the overall reconnaissance work and effort at Gettysburg Day-1, saying nothing of Brandy Station. These actions made the AOP's cavalry corps into a fighting force that had to be reckoned with through the end of the war. Not replacing Buford guarding the left when relieved and sent to Westminster Day-2 did not become an issue. ** See Sickles.
7 Slocum; Staying at Two Taverns five miles south of town (arrived 11AM) not coming to the field Day-1 to take command enabled the loss to become a rout and near disaster. Division commander Geary getting lost (guides?) returning to a place (LRT) he just vacated a few hours before Day-2 is bewildering. Green's brigade fought well but credit eight other regiments we know of who came to their aid; 6th Wis, 14th Brooklyn, 147 NY (Wadsworth of 1st), 61st Oh, 157th and 45th NY, 82 Ill (Schmmelfennig of 11th) and 71st Pa (Webb of 2nd).
8 Sickles; Credit to Sickles (Birney, Hunt?) for sending 3rd Maine and 1st US-SS on Pitzer Woods recon noon Day-2 to discover Longstreet (Anderson) advancing the line to that point.
**** Reynolds; No idea where to place but entrusted with the left wing of army (closest to Lee) tells us what Meade thought of him. Most agree Doubleday fought the corps well. Newton was competent enough to have Meade's confidence with the elevation to corps command.
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