Interestingly, the official article has JSerra listed ahead of Trabuco Hills, which wouldn't be the case in a 16 team power merge. It also has the number 126 next to Buchanan, which seems to imply that they scored 126 points in the power merge, which would mean an 18 team power merge. If that is indeed the case, these would be the power merge results:
1 Buchanan 126
2 Mira Costa 150
3 JSerra Catholic 172
4 Trabuco Hills 174
5 Santiago Corona 179
6 Archie Williams 198
7 Whitney 228
8 El Toro 237
9 Davis 238
10 Claremont 242
11 St. Francis-Sac 257
12 Santa Margarita 258
13 Westlake 279
14 Sage Creek 282
15 Saint Francis 309
16 Point Loma 312
17 Great Oak 315
18 San Clemente 328