In case people want some comparisons for Zacha, read below. I feel better after looking at this. Zacha was on the fast track in the Czech Republic, playing in the U20 league when he was 15 and dominating. No other recent Czech prospect ascended so fast so quickly.
Zacha:
16-year old season (13-14): 38gp, 4g, 4a, 8p, 0.21ppg in Czech men's league
16-year old season (13-14): 10gp, 6g, 11a, 17p, 1.70ppg in Czech U20 league
15-year old season (12-13): 39gp, 14g, 26a, 40p, 1.03ppg in Czech U20 league
15-year old season (12-13): 6gp, 6g, 7a, 13p, 2.17ppg in Czech U18 league
Hertl:
18/19-year old season (11-12): 38gp, 12g, 13a, 25p, 0.66ppg in Czech Men's league
17/18-year old season (10-11): 33gp, 14g, 27a, 41p, 1.24ppg in Czech U20 league
16/17-year old season (09-10): 42gp, 12g, 26a, 38p, 0.91ppg in Czech U20 league
16/17-year old season (09-10): 7gp, 13g, 10a, 23p, 3.29ppg in Czech U18 league
15/16-year old season (08-09): 35gp, 16g, 15a, 31p, 0.89ppg in Czech U18 league
Pastrnak:
15-year old season (11-12): 40gp, 41g, 27a, 68p, 1.70ppg in Czech U18 league
14-year old season (10-11): 16gp, 7a, 12a, 19p, 1.19ppg in Czech U18 league
Sekac:
16-year old season (07-08): 46gp, 38g, 49a, 87p, 1.89ppg in Czech U18 league
Jaskin:
18-year old season (11-12): 30gp, 1g, 1a, 2p, 0.07ppg in Czech Men's league
18-year old season (11-12): 10gp, 6g, 11a, 17p, 1.70pph in Czech U20 league
17-year old season (10-11): 33gp, 3g, 7a, 10p, 0.30ppg in Czech Men's league
16-year old season (09-10): 40gp, 13g, 10a, 23p, 0.58ppg in Czech U20 league
16-year old season (09-10): 12gp, 15g, 12a, 27p, 2.25ppg in Czech U18 league
15-year old season (08-09): 46gp, 28g, 19a, 68p, 1.02ppg in Czech U18 league
14-year old season (07-08): 40gp, 15g, 25a, 40p, 1.00ppg in Czech U18 league
Palat:
17-year old season (08-09): 42gp, 23g, 33a, 56p, 1.33ppg in Czech U20 league
16-year old season (07-08): 42gp, 19g, 18a, 37p, 0.88ppg in Czech U20 league
15-year old season (06-07): 33gp, 32g, 24a, 56p, 1.70ppg in Czech U18 league
14-year old season (05-06): 22gp, 2g, 7a, 9p, 0.41ppg in Czech U18 league