This. At best Jacob gets 7 - 8 golds: 4 would be pretty much gauranteed - 800, 1500, 5k, 10k, and 2 would be very likely - marathon (if he doesn't get too tired from running everything else), and 3k steeple (if he can not fall down over hurdles), and maybe two more are a stretch - 400 (think he could go sub 50 based on his kicks - he's closed in 23 sec 200 for a 1500m/5k, definitely needs Sydney not to run, which she isn't, and he would struggle with the blocks).
Now lets look at the top ranked decathlete, Pierce Lepage's PBs
100 Metres - 10.28
200 Metres - 20.83
400 Metres - 46.84
1500 Metres - 4:31.85
110 Metres Hurdles - 13.77
High Jump - 2.09 (womens season best is 2.10)
Pole Vault - 5.25 (womens season best is 4.92)
Long Jump - 7.80 (womens season best is 7.22)
Triple Jump - 14.14 (womens season best is 15.01)
Shot Put - 15.99 (womens season best is 20.68, but dif weight)
Discus Throw - 53.26 (womens season best is 73.09, but dif weight)
Javelin Throw - 63.09 (womens season best is 66.7, but dif weight)
So it looks like he would be lock at gold in 7 events (100, 200, 400, 100h, long jump, and pole vault, heptathlon) and would have an excellent chance in the high jump, 400h, and javeline (given the different weight/length), but he quite far from the top discus and shot putters such that I doubt the different weight would allow him to get into the gold contention. He also has a good chance at the 800m with a 46.84 400m PB, and a 4:31 PB in the 1500m at the end of the decathlon. Canada also has reasonable 4x100 and 4x400 teams so having a 46 low split or his rediculous 100m split could get them close to a gold. Oh and lets not forget the heptathlon
I'd put the expected number of golds at ~10, which is way more than Jakob could do.