The White Ranger was stated by Zordon to be More powerful than Green and even as evil Green I doubt Tommy could solo a more experienced group of Rangers.
Dude, every new thing in the Power Ranger franchise was stated to be "more powerful" than what came before it. It's BS storytelling and a cheap copout.
When White Ranger Tommy fought the Clone of the Green Ranger (clone of himself), they tied in physical confrontation. If the White Ranger could only tie a clone, imagine what the real thing would have done!
Also, the Dragonzord is part of the original Dinozord lineup. The Tigerzord is part of the Thunderzord lineup. Zordon stated the Thunderzords were significantly more powerful than the Dinozords, yet when the Tigerzord fought the Dragonzord, the Dragonzord stomp'd it easy.