Correct...all quals are required to move to higher Tier.
Upgrade to Capt is based upon meeting minimum hrs also so if one enters with just the mins, upgrade may occur for others hired at the same time or after you based upon meeting those minimum hrs...
BTW, I flew about 600 hrs my first year 07/19-07/20.
Upgrade is not by seniority but by CA recommendations, other job performance criteria...most upgrade when all the blocks are checked but no mandatory up or out upgrades. The APC info states upgrades at 12 months for the X, not the case now.
Too soon to for updated timeframe but expect less than 2 yrs conservatively, 18 months possible if more X’s are bought. Not sure for the 300 folks.