Oh Episkopos, you are dividing what God has joined together!
Indeed, God has and is dividing the light from the darkness, but both "mercy and truth" are of the Light. So, what you have assembled is off in the weeds of many speculation doctrines.
That difference or duality that you are basing it all on, to the contrary, is not two forms of salvation, but is the defining points between the first and last resurrection. Which many do not fully understand, if at all. The first resurrection is not some distant future wave of special resurrection--but is resurrection life given--since Pentecost--to those who are "faithful in a very little, have authority over" much more during this present reign of Christ who has "been given all authority...in heaven and earth" during these times of the church among the gentiles.
Jesus also referred to this difference in a warning to those who "believe" and thus assume they are "saved", but are not serving "truth" after receiving "salvation." In which case, He said He "will cut him in two and appoint him his portion with the hypocrites. There shall be weeping and gnashing of teeth"). Which cuts them out of the full measure of the first resurrection--worse than for the "evil servant" who buried the one talent given to him. Thus, "weeping and gnashing of teeth."
So...unless one's otherwise fine job is in perfect alignment--without speculations, or thinking, or teachings of men--they get "cut."
Which, yes, would all seem to agree with no doctrine. But that is where we are at--and it's not the first time--just look to the past, this is a repeat by the church among the gentiles.