26 should be a grid route 100% 7 days a week and not service CCTT. Its like 19 that wasted riders time who have no need to to use CCTT in the first place. It will add a few minutes for riders who want to get to/from Sq One Mall as well more transferring time to get to/from CCTT. Riders have a choice of using 6, 61, 3, 8 and 19 to get to/from CCTT.Just a few takeaways from what you've said:
26 should just be restored to serve CCTT directly. The 76 is useful for getting to those office towers on Robert Speck and shouldn't be changed.
61 Mavis used to run down to Dundas (the short turn branch that looped down around Clayhill and Dundas) but was replaced by the 91 Hillcrest.
13 Glen Erin is a very useful route but runs too infrequently. I'd like it if there was some express version like combining the 110 and 109 (I'd restore direct service to Credit Valley Hospital and Erin Mills Town Centre) but serving the entire corridor from Westgate/Lisgar GO down to Clarkson GO.
28 and 66 combined would be useful, but the 28 serves far more high density areas and thus needs to be kept at more frequent headways.
45 is not high ridership precisely because the 109 cannibalizes much of its ridership in the north end.
West of CCTT has poor ridership than the east. My Recommendation for the 86 when it ran was to have it only run east from CCTT since this was the bulk of the route ridership. Ridership was very rarely more than 15-20 west of CCTT at best of time with less than 10 on it at other times.
76 should be running 7 days a week.
The feeling in management is that 26 should be be a grid route and willing to live with the current weekend routing for the time being. It needs better service on the weekend than now.
61 did run to Dundas by CCTT, but there should be one that bypass CCTT and go to Cooksville Go Station by Dundas, not like the 91 or the old 61. It would take some pressure off the 19s and doing a transfer at CCTT.
13 like a lot of routes needs better service 7 days a week, but does not come close to having a 100 bus on it.
I can see another route combining 28 & 66 that would offer a grid service and take pressure off 19.
45 will be a weak route, but fill the gaps between the 109 stops. It needs better service as well. It was weak before the 109 started. The 109 help some of the 9 ridership these days.